kalyan online 4 u

google search engine tricks

2010-02-08T01:41:00.001+05:30

Folllowing are some of the best search engine tricks in google:

http://google.about.com/od/searchingtheweb/tp/searchtrickstp.htm

Basics of using jTemplate

2009-10-01T12:51:00.009+05:30

Hi All,

jTemplate is a wonderful plugin for json data. It reduces a lot of markup repition on client-side. It works like a repeater control in asp.net but the repeater is implemented on the client-side.Following are simple steps to implement jTemplate.

First in the head section put the following code.

That is all for the head part. Now in the body section
have a container element(div works) which will list
the json data.

Now you can see the result of json data printed
as li elements on the page.

Code for Masked Slider Plugin

2009-08-19T18:58:00.002+05:30

Following is the code for the masked slider plugin. Just copy the code and paste it in a javascript file.

var timer = null;

(function($) {
$.fn.maskedSlider = function(options) {

var defaults = {
stripHeight: 50,
topSliderColor: 'gray',
bottomSliderColor: 'gray',
opacity: 0.6,
duration: 1500,
horizontal: true
};

var options = $.extend(defaults, options);
var flag = true;
var element = $(this).attr("id");
var elementWidth = $(this).width();
//if you want the paddding and border to be included in the width then uncomment the following lines
/*var elementWidth = $(this).width() +
parseInt($(this).css("padding-left"),10) +
parseInt($(this).css("padding-right"),10) +
parseInt($(this).css("border-left-width"),10) +
parseInt($(this).css("border-right-width"),10);
*/
var elementHeight = $(this).height();
//if you want the paddding and border to be included in the height then uncomment the following lines
/*var elementHeight = $(this).height() +
parseInt($(this).css("padding-top"),10) +
parseInt($(this).css("padding-bottom"),10) +
parseInt($(this).css("border-top-width"),10) +
parseInt($(this).css("border-bottom-width"),10);
*/
var topDivId = element + "_top";
var bottomDivId = element + "_bottom";
var leftDistance = 0;
var topDistance = 0;

$(this).css("position", "relative");
$(this).append("

");
$(this).append("

");

/*Settings for the top/left slider*/
$("#" + topDivId).css({
"position": "absolute",
"background-color": options.topSliderColor,
"opacity": options.opacity,
"-moz-opacity": options.opacity,
"-khtml-opacity": options.opacity,
"left": leftDistance,
"top": topDistance
});

if (options.horizontal) {
$("#" + topDivId).css("width", elementWidth);
$("#" + topDivId).css("height", 0);
}
else {
$("#" + topDivId).css("height", elementHeight);
$("#" + topDivId).css("width", 0);
};
/*end settings for the top/left slider*/

/*settings for the bottom/right slider*/
$("#" + bottomDivId).css({
"position": "absolute",
"background-color": options.bottomSliderColor,
"opacity": options.opacity,
"-moz-opacity": options.opacity,
"-khtml-opacity": options.opacity
});

if (options.horizontal) {
$("#" + bottomDivId).css({
"height": elementHeight - options.stripHeight,
"width": elementWidth,
"left": leftDistance,
"top": topDistance + options.stripHeight
});
}
else {
$("#" + bottomDivId).css({
"height": elementHeight,
"width": elementWidth - options.stripHeight,
"left": leftDistance + options.stripHeight,
"top": topDistance
});
};
/*end settings for the bottom slider*/

timer = setInterval(function() {
if (flag) {
flag = false;
if (options.horizontal) {
$("#" + topDivId).stop().animate({
height: elementHeight - options.stripHeight
}, options.duration);
$("#" + bottomDivId).stop().animate({
height: 0, top: topDistance + elementHeight
}, options.duration);
}
else {
$("#" + topDivId).stop().animate({
width: elementWidth - options.stripHeight
}, options.duration);
$("#" + bottomDivId).stop().animate({
width: 0, left: leftDistance + elementWidth
}, options.duration);
};
}
else {
flag = true;
if (options.horizontal) {
$("#" + topDivId).stop().animate({ height: 0 }, options.duration);
$("#" + bottomDivId).stop().animate({
height: elementHeight - options.stripHeight,
top: topDistance + options.stripHeight
}, options.duration);
}
else {
$("#" + topDivId).stop().animate({ width: 0 }, options.duration);
$("#" + bottomDivId).stop().animate({
width: elementWidth - options.stripHeight,
left: leftDistance + options.stripHeight
}, options.duration);
};
};
}, options.duration);

};
})(jQuery);

(function($) {
$.fn.stopSlider = function() {
clearInterval(timer);
}
})(jQuery);

You can see the demo at: http://calyan.co.cc/Demo.php

Detect your best pals Yahoo Messanger Status

2009-07-01T20:15:00.006+05:30

Hi Frnds,

At any time, if you need to check the yahoo messanger status of some one, just visit this site:

http://detectinvisible.com/

Yet there are many other sites which provide you with the same functionality, i found this as the best one.

Rounded Corners Using CSS

2009-06-30T19:39:00.002+05:30

Hi All,

Ever wondered if you have an option to create rounded div using css. Not in all browsers but the most popular browser i.e., the mozilla has such an option. To have rounded corner for a div we just need to give it as,

#myDiv
{
border:solid 1px black;
-moz-border-radius-bottomleft: 10px;
-moz-border-radius-bottomright:10px;
-moz-border-radius-topleft:10px;
-moz-border-radius-topright:10px;
}

or you can give all in a single line as

#myDiv
{
border: solid 1px black;
-moz-border-radius: 10px;
}

For Safari broswer, you can use

-webkit-border-radius: 10px;

or you can specify individually as

-webkit-border-top-right-radius: 10px;
-webkit-border-top-leftt-radius: 10px;
-webkit-border-bottom-right-radius: 10px;
-webkit-border-bottom-left-radius: 10px;

For more information, please visit:
http://www.the-art-of-web.com/css/border-radius/

Power of semi-colon in javascript

2009-06-22T17:38:00.003+05:30

I have been scripting since 2years from now and when i saw this link:

http://robertnyman.com/2008/10/16/beware-of-javascript-semicolon-insertion/

I thought there is some thing new, infact a lot more about javascript that i should know. Please go thru this link to have more understanding of semicolon.

Also while using jquery if you use the jquery file as,

The correct usage would be

Masked Slider Plugin in jQuery

2009-06-19T17:15:00.006+05:30

Hi All,
This is my post after a long break. Well i have been looking into different technologies like photoshop, blend and i stopped at flash. I saw a simple and sweet animation in flash that suits excatly for displaying products.
After few days i succeeded to implement the same feature in jQuery.
So here is a sample screen-shot of how it looks like.

The slider moves up and down giving a pretty cool visual experience for viewers. The image is set a background image for the containing div element. You just need to call the slider plugin as,

$("#divWithBgImage").maskedSlider({defaultOpacity : 0.6, stripHeight: 55});

That's it and the rest of the visual effects are applied by the plugin. Also the plugin has many options that it supports. Here are the list of supported options:

{
defaultOpacity : 0.6,
stripHeight : 40,
topSliderColor : gray,
bottomSliderColor : gray,
duration : 2000,
horizontal : true
}

The options are self explainable. The last option specifies that the slider will move vertically if horizonal : false is specified.

Note: The function can be called only once within a page. i.e., it can be called on any div element within a page once and only once.

The problem here is - i m adding new html elements on given div and animating their height and position. If its called for more than one div then there will be a runtime conflict in the browser because the same id exists(newly added html elements thru plugin) for called div elements.
I assure you my next post will give a solution to this problem.
If any one is intrested to get the plugin, Reply me or email me at calyan.bandi@gmail.com or you can email me at buntychitti@yahoo.com

Convert a Canvas into an Image

2009-04-23T18:16:00.003+05:30

Hi,
I have once faced this problem and google produced me with pieces of information which i grouped into the following. The below function will take a Canvas element as an input and makes an image out of it.

public static BitmapDecoder CreateImageFromCanvas(UIElement element, int dpix, int dpiy, ImageFormat format)
{
double dpiX = 96;
double dpiY = 96;

FrameworkElement fwElement = element as FrameworkElement;
Rect bounds = VisualTreeHelper.GetContentBounds(fwElement);
bounds = new Rect(0, 0, fwElement.Width, fwElement.Height);

// create the renderer.
RenderTargetBitmap rendertarget = new RenderTargetBitmap((Int32)(bounds.Width * dpiX/96.0),
(Int32)(bounds.Height*dpiY / 96.0), dpiX, dpiY, PixelFormats.Pbgra32);
// Render the element on screen.
rendertarget.Render(element);

BitmapEncoder bmpe;

// Select the image format.
if (format == ImageFormat.Png)
{
bmpe = new PngBitmapEncoder();
}
else if (format == ImageFormat.Bmp)
{
bmpe = new BmpBitmapEncoder();
}
else if (format == ImageFormat.Jpeg)
{
bmpe = new JpegBitmapEncoder();
}
else
{
bmpe = new PngBitmapEncoder();
}

bmpe.Frames.Add(BitmapFrame.Create(rendertarget));

Stream fl = new MemoryStream();
bmpe.Save(fl);

BitmapDecoder bmpd;
// Select the image format.
if (format == ImageFormat.Png)
{
bmpd = new PngBitmapDecoder(fl, BitmapCreateOptions.IgnoreColorProfile, BitmapCacheOption.Default);
}
else if (format == ImageFormat.Bmp)
{
bmpd = new BmpBitmapDecoder(fl, BitmapCreateOptions.IgnoreColorProfile, BitmapCacheOption.Default);
}
else if (format == ImageFormat.Jpeg)
{
bmpd = new JpegBitmapDecoder(fl, BitmapCreateOptions.IgnoreColorProfile, BitmapCacheOption.Default);
}
else
{
bmpd = new PngBitmapDecoder(fl, BitmapCreateOptions.IgnoreColorProfile, BitmapCacheOption.Default);
}

MemoryStream mStream = (MemoryStream)fl;
System.IO.File.WriteAllBytes("F:\\Samples\\myimage."+format, mStream.ToArray());

fl.Close();

return bmpd;
}

Remember you can only pass a canvas element as an argument to this function. Ofcourse it accepts any UIElement but if you pass anything other than a Canvas element you will get a blank image.

Subsequently you can use this function in your main class file like,
myImage.Source = GrapSnapShot(myCanvas, 89,89,ImageFormat.Png).Frames[0];
where myImage is an Image element in your xaml file and it displays your canvas as an image.

Difference between Logical and Visual Tree in WPf

2009-04-21T18:01:00.001+05:30

Hi All,
Just go through this link:

http://blogs.msdn.com/mikehillberg/archive/2008/05/23/Of-logical-and-visual-trees-in-WPF.aspx

Accessing template elements of a usercontrol

2009-04-13T15:13:00.002+05:30

Hi Frnds,
In the last post I explained of creating a user control which acts like a container. In this post I will explain how to change the properties of your user control. The following steps will clear you about this,
1. Create a public property for the user control, accessing on which you will change the properties of your usercontrol. This is something like,
Private string someText;
Public string SomeText
{
Set { this.txtName.Text = value; }
Get { return txtName.Text; }
}
2. Since your properties are kept inside control template you cannot refer them simply by name as above.i.e.,this.txtName is not accessible if txtName is name of an element inside the control template.To access that element you need to have something like,
TextBlock txtBlock = (TextBlock)Template.FindName(“txtName”,this);
So if you think of something like,
Set
{
TextBlock txtBlock = (TextBlock)Template.FindName(“txtName”,this);
txtBlock.Text = value;
}
Then you are mistaken. This is because inside the setter you cannot fill the object txtBlock. This means that you will get a null reference when you run the above code. The reason is control hierarchy loading. When your setter method is executing your TextBlock is not yet created and so it will return an error(a run-time error).So the solution would be to set the value inside onApplyTemplate().The overall code looks like this:
MyUserControl.xaml
<USerControl x:Class="MyUserControl" Height="Auto" Width="Auto"......>
<UserControl.Template>
<ControlTemplate>
<Grid>
<Border Height="Auto" Width="Auto" Background="{TemplateBinding Property=ContentControl.Background}" CornerRadius="10" Name=”myContainer”>
<ContentPresenter Content="{TemplateBinding Property=ControlContent.Content}" />
</Border>
</Grid>
</ControlTemplate>
</UserControl.Template>

MyUserControl.xaml.cs
Public partial class MyUserControl : UserControl
{
Public MyUserControl()
{
InitializeComponent();
}
Public override void OnApplyTemplate()
{
Border border = (Border)Template.FindName(“myContainer”,this);
border.CornerRadius = new CornerRadius(topLeftRadius,0,10,0);
base.OnApplyTemplate();
}
Private double topLeftRadius;
Public double TopLeftRadius
{
Set { topLeftRadius = value; }
Get { return topLeftRadius; }
}
}

And in the main window Main.xaml
<Window…….>
<MyUserControl Background=”Chocolate” Height=”100” Width=”65” TopLeftRadius=”20”>
<TextBlock HorizontalAlignment=”Center” VerticalAlignment=”Center”>Some Text </TextBlock>
</MyUserControl>
</Window>

Please feel free to scold me if anything wrong mentioned.
Hope this was helpful

Creating UserControl to hold other controls in WPF

2009-04-01T19:42:00.005+05:30

Hi Friends,
You can find many samples in google for creating user controls and my post stands little adhead of them.
Firstly if you create a user control and in the main window where you use the usercontrol, if you try to put some content within your usercontrol, it will throw an error. This is because your usercontrol is not designed to handle other wpf elements within it. To make this happen you have to follow a different apporach.
The following is a sample code for creating such a control:
<USerControl x:Class="MyUserControl" Height="Auto" Width="Auto"......>
<UserControl.Template>
<ControlTemplate>
<Grid>
<Border Height="Auto" Width="Auto" Background="{TemplateBinding Property=ContentControl.Background}" CornerRadius="10">
<ContentPresenter Content="{TemplateBinding Property=ControlContent.Content}" />
</Border>
</Grid>
</ControlTemplate>
</UserControl.Template>

And in your main window just add it as
<MyUserControl Background="LightBlue" Height="50" Width="75">
<Button content="Push Me">
</MyUserControl>

Remember here both MyUserControl and the Main window remain in the same namespace. The result of the above code will be a rounded rectangle with a button inside it. Creating a rounded rectangle as an usercontrol is easy but it will not act like a container for holding for other elements. What the magic i have done here is, i've defined the look of my usercontrol as rounded rectangle inside the usercontrol template and mainly the ContentPresenter Tag which makes the control to hold other items. Other important issue to look at is the TemplateBinding. I will not explain about TemplateBinding for now but you can find many sites that will help you around.
In my next post i'll explain how to change/access the cornerradius of the rectangle from code-behind of the usercontrol which will help you to expose the accessibility to the main window.

Double-click solution file to create your web site

2009-03-24T14:20:00.003+05:30

Hi all,
In Visual Studio, if you have to go for any web based content you will be left with two choices - web site/web application. Here is one difference that may be helpful for your selection criteria:

Create a solution file.
Add a new project and select the project type as "Asp.Net Web Application".
Right click on this web application and select properties - go to 'Web' tab, under server you will find the radio box 'Use Visual Studio Development Server' selected. Below that is the radio box 'Use Local IIS Web server'. Uncheck the former and select the later one.
Now when you export your solution file to another machine and when you double-click the solution file, your web site is automatically created in the IIS Server of that machine.

If you select a new web site to be added to your solution file then you won't find such an option as described above. So if you have a web site added to your solution file and when you open the solution file in another machine, the default url will be something like 'http://localhost/MySite/MyPage.aspx' and this means a site located in that machine. But since you don't have any such site published in IIS yet, your visual studio will warn you about this and the project will be unavailable.

Difference between Raster Image and Vector Based Images

2009-03-13T15:29:00.002+05:30

Hi All,
In differentiating the two kinds of images what i conclude is "Vector based images are mathematical images - this implies that these are image format used by computers. This is true because a raster image has definition defined pixel by pixel.
For a better understanding pls go through the following link:
http://www.nw-media.com/photography-articles/31/raster-vs-vector/

ADO.NET Entity Framework and Linq Framework

2009-03-03T14:48:00.004+05:30

I googled for this and i have found the following links which will clear many confusions

http://msdn.microsoft.com/en-us/library/cc161164.aspx

http://dotnetaddict.dotnetdevelopersjournal.com/adoef_vs_linqsql.htm

http://social.msdn.microsoft.com/forums/en-US/adodotnetentityframework/thread/55a7a796-2bef-4df9-b858-2f9804d39af5/

http://dotnethitman.spaces.live.com/blog/cns!E149A8B1E1C25B14!195.entry

Please go thru these links once.

Writing Your Own HttpHandler

2009-02-19T15:01:00.003+05:30

Hi All,

Today i'll explain how to write our own handler for a new kind of page. Firstly, Handlers(as the term explain) are for handling things. These things are client requests. So for a client request to Default.aspx there will be a handler. This will be a default handler which will ship along with asp.net runtime. If you have new kind of extension you can writer your own handler.

The reason of writing this blog is for a good understanding of http handlers. I insist you to follow these steps and create your own handler. I have followed these procedures from the site:

http://www.15seconds.com/Issue/020417.htm

Step 1:

In u r VS, create a new c# class library and the name the class as MyOwnHandler.

The code should be

using System;

using System.Web;

using System.Text;

namespace MyCustomizedHandler

{

public class MyOwnHandler: IHttpHandler

{

public MyOwnHandler()

{

}

#region for implementing HttpHandler

Public void ProcessRequest(HttpContext context)

{

HttpResponse responseObject = context.Response;

responseObject.Write("<html><body><h1>My Customized page</h1>");

responseObject.Write("</body><html>");

}

Public bool IsReusable

{

get

{

return true;

}

#endregion

}

Rather than copying and pasting i insist all of u to type this small piece of code manually. Now just compile this from ur VS and paste the output of this dll into a virtual folder webapplication. I have a website in my iis with the name 'jsonSamples', so i placed the dll output of the above code into the bin directory of 'jsonSamples'.

Step2:

Now open the web.config file of the webapplication(in my case 'jsonSamples') and add the following piece of code inside it:

</httpHandlers>

Step3:

All what we have done is in the application level. i.e., our application knows how to render a request for the page type .sample. Now we have to tell this to the iis webserver also. For that we have to do:

Launch IIS, right click on Default Web Site, go to home directories tab, click on configuration. This will open a new window. Now click on the add button and in the Executable section give the url of the aspnet_isapi.dll. Down to it, the extension should be given as 'sample'.

Click all ok's and close the window.

Now from ur browser just make a request some thing like this:

http://localhost/jsonSamples/helllo.sample

http://locahost/jsonSamples/239kshrkweh.sample

http://localhost/jsonSamples/anything.sample

You should get the output. (But i didn't get the output for the first time)

If u dont get the output then dont panic, just open ur webapplication(jsonSamples) in VS and for it add reference of u r class library dll. Even though u have placed the dll in the bin directory of the webappliation but u need to do add reference to the same item once again from VS. I dont know why but it works.

Hope this helped.

Improve u r english

2009-02-16T13:07:00.002+05:30

Hi Friends,

I have found a site that help u improving u r english skills. It was really helpful for me. May be u should also take a look at it.

http://www.pandorabots.com/pandora/talk?botid=f5d922d97e345aa1

List all Running Applications through windows script

2009-02-13T12:12:00.003+05:30

Hi All,

The following is a simple script which will list all the applications inside ur taskmanager applications tab.

Set objWord = CreateObject("Word.Application")

Set colTasks = objWord.Tasks

For Each objTask in colTasks

If objTask.Visible Then

Wscript.Echo objTask.Name

End If

objWord.Quit

Must and should read link:

http://www.microsoft.com/technet/scriptcenter/topics/office/tasks.mspx

Infact i actually copied the above code from this link only. This was really very helpful and it explained me a lot. I'd simply like to say: "All the processes which are not running in hidden mode are listed in the applications tab.If a process doesn't have a visible window then it will not be present in the applications tab."

I really insist all of u to go through the above link for a better understanding of things.

Hpy Scripting.........

Open Yahoo Mail through Windows Script

2009-02-09T18:41:00.009+05:30

Hi People,

I'm a Newbie to scripting world. I thought of writing a windows script which will take my credentials and automatically logs me into yahoo. With lots of googling i m able to write the following code:

set objIE = CreateObject("InternetExplorer.Application")

objIE.Navigate "www.mail.yahoo.com"

objIe.Visible = true

'wait untill page gets loaded

While objIE.busy

WScript.Sleep 1000

Wend

objIE.document.getElementByID("username").value = "my_username"

objIE.document.getElementByID("passwd").value = "my_password"

objIE.document.getElementsByName(".save")(0).click()

That's it. Copy and paste the above code. Yeah pls fill corresponding username and password fields. This code needs to be worked in the following sections:

1)Inside the if condition i m finding the username textbox through DOM selection and then filling in the appropriate fields. But this may affect if the textbox name changes.

The following are some of the links where u can find some more useful information:

http://www.visualbasicscript.com/m_68329/tm.htm

http://www.visualbasicscript.com/m_68329/mpage_1/tm.htm#68433

http://my.safaribooksonline.com/0735622442/ch03lev1sec9

CSS Tips

2009-01-28T21:01:00.002+05:30

The disadvantage of using table-layout is, once the entire table is loaded then only u can view it. This is a performance issue interms of user experience, for ex if u have table with hundred images, until all the images r loaded u cannot see them. Instead if u follow some other way like using div's, it might be good.

Also dont overwrite styles until unless they r explicitly required. This is because if u have color coming for a p element from two style rules then it is considered as an error in css validator checks.

Giving negative margins will mess up things in IE6.

Nullable Types in C#

2008-12-22T18:33:00.002+05:30

int x = 0; //valid statement
int y = null; //compile time error

This is because we know that null is a value for reference types and since int is a value type it cannot hold the value null in it. So if there comes a situation where u need to hold null value inside an int then the solution is the Nullable Type.

Any Value Type can be Nullable Type, which means that the default value can hold the possible value in its data range as well as a new value 'null' in it. The syntax for this is,

int? x = null; //valid statement; now x is a nullable type

Also dont guess that since now x can hold null value, it can be reference type. This is wrong. What Nullable Type is like a wrapper around a value type which can hold a null value also. So the value of x is stored in stack(by default).

CodeBehind Files in asp.net

2008-12-18T15:46:00.003+05:30

Hey Friends, check the following links to get an indepth understanding of code-behind classes for aspx pages.

Before going to these links check ur self that in VS2008, for a website u will find CodeFile attribute in the page directive, whereas for a web application u will find CodeBehind attribute in the page directive.

http://www.ddj.com/windows/187202007

http://www.pluralsight.com/community/blogs/fritz/archive/2005/01/18/5111.aspx

Enable IE6 Toolbar

2008-12-03T18:33:00.002+05:30

I had the same problem with the IE toolbar (IE7 under win 2003, using it to style a Sharepoint site). A combination of the suggested solutions did the trick:

Tools->Internet options->Security Tab->Local Intranet->Custom Level->Run ActiveX Control or PlugIn (Administrator Mode)
Tools->Internet Options->Programs->Manage add-ons->IEDeveloperToolbarBHO->Enable
Tools->Internet Options->Advanced->Enable third party browser-extensions (requires restart)

call a WebService from Browser(javascript code)

2008-11-07T12:56:00.003+05:30

Following links are helpful for making a webservice request

http://debasishpramanik.wordpress.com/2007/08/17/calling-web-service-using-xmlhttp-object/#comment-1021

For getting Basics:

http://www.codeproject.com/KB/aspnet/XmlHttpWS.aspx
http://www.howtocreate.co.uk/tutorials/javascript/domstructure

Creating a Simple User Control

2008-11-03T14:36:00.003+05:30

User controls allow you to save a part of an existing ASP.NET page and reuse it in many other ASP.NET pages. A user control is almost identical to a normal .aspx page, with two differences: the user control has the .ascx extension rather than .aspx, and it may not have

<HTML>, <Body>, or <Form> tags.

The simplest user control is one that displays HTML only(.ascx file)


<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="WebUserControl1.ascx.cs" Inherits="MyUserControl.WebUserControl1" %>









    
        CopyRight 2008 Ramp Infotech, Inc.
    
    
        Support at http://www.rampgroup.com

To see it work add this in the .aspx file as:

<%@ Register tagprefix="ramp" TagName="CopyRight" src="CopyRight.ascx" %>

This registers the control with our page and we can use it like

What is there in _VIEWSTATE field?

2008-11-03T10:24:00.001+05:30

First of all _VIEWSTATE is a field(HTML Element) and its different from what we think about a ViewState.

Now, Will you have a value stored in the _VIEWSTATE field if it is a blank ASP.NET Page or ViewState completely diabled. The answer is yes. If we see the viewsource of this blank page we can find a small serialized value. The reason is the page itself saves approximately 20 bytes of information into the _VIEWSTATE field, which it uses to distribute postback data and viewstate values to the correct controls upon postback.

Data stored by developers using the Viewstate[""] indexer.
Programmatic changes to the control state.

OK, so let us assume that we have a web page with only a Label control on it. Now, let us say that at design time, if we set the “Text” property of the Label to “statictext”. Now, load the page and open the View Source page. We can see the __VIEWSTATE field. Do you think “statictext” is saved there? The answer is, for sure, not. Recall that static properties of controls are assigned at the generated class. So, when the page is requested, the values stored in the generated class are displayed. As such, static properties that are set at design time are never stored in the __VIEWSTATE field. However, they are stored in the generated compiled class, and thus they show up when rendering the page.

Now if we change the label "Text" property to "dynamicText" in the page load then this "dynamicText" is saved in the _VIEWSTATE field. The reason is we have changed the label's "Text" property at run-time and this is done at the page load time during which the tracking of viewstate is enabled(TrackViewState() is enabled in the InitComplete event), the "Text" property is marked as "Dirty" and thus the "SaveViewState" will save the controls new value in the _VIEWSTATE field!

Keep Smiling and Programming!!

ViewState - Dynamic Controls

2008-11-01T18:12:00.000+05:30

The first fact that you should know about dynamic controls is that they should be added to the page at each and every page execution. Never wrap the code that initializes and adds the dynamic control to the page inside a “!IsPostback” condition. The reason is that since the control is dynamic, it is not included in the compiled class generated for the page. So, the control should be added at every page execution for it to be available in the final control tree. The second fact is that dynamic controls play “catch-up” with the page life cycle once they are added. Say, you did the following:

Label lbl = new Label();
Page.Controls.Add(lbl);

Once the control is added to the “Controls” collection, it plays “catch-up” with the page life cycle, and all the events that it missed are fired. This leads to a very important conclusion: you can add dynamic controls at any time during the page life cycle until the “PreRender” event. Even when you add the dynamic control in the “PreRender” event, once the control is added to the “Controls” collection, the “Init”, “LoadViewState”, “LoadPostbackdata”, “Load”, and “SaveViewstate” are fired for this control. This is called “catch-up”. Note though that it is recommended that you add your dynamic controls during the “PreInit” or “Init” events. This is because it is best to add controls to the control tree before tracking of the Viewstate of other controls is enabled…

Finally, what is the best practice for adding dynamic controls regarding Viewstate? Let us say that you want to add a Label at runtime and assign a value to its “Text” property. What is the best practice to do so? If you are thinking the below, then you are mistaken:

Label lbl = new Label();
Page.Controls.Add(lbl);
lbl.Text = "bad idea";

You are mistaken because using the above technique you are actually storing the value of the “Text” property in the Vewstate. Why? Because, recall that once a dynamic control is added to the “Controls” collection, a “catch-up” happens and the tracking for the Viewstate starts. So, setting the value of the “Text” property will cause the value to be stored in the Viewstate.

However, if you do the below, then you are thinking the right way, because you are setting the “Text” property before adding the control to the “Controls” collection. In this case, the value of the “Text” property is added with the control to the control tree and not persisted in Viewstate.

Label lbl = new Label();
lbl.Text = "good idea";
Page.Controls.Add(lbl);

Reducing ViewState - Disabling ViewState

2008-11-01T18:05:00.001+05:30

Disabling Viewstate would obviously reduce Viewstate size; but, it surely kills the functionality along the way. So, a little more planning is required…

Consider the case where you have a page with a drop down list that should display the countries of the world. On the “Page_Load” event handler, you bind the drop down list to a data source that contains the countries of the world; the code that does the binding is wrapped inside a “!IsPostback” condition. Finally, on the page, you have a button that when clicked should read the selected country from the drop down list. With the setup described above, you will end up with a large __VIEWSTATE field. This is due to the fact that data bound controls (like the drop down list) store their state inside the Viewstate. You want to reduce Viewstate; what options do you have?

Option 1: Simply disable the Viewstate on the drop down list
Option 2: Disable the Viewstate on the drop down list, and remove the “!IsPostback” condition
Option 3: Disable the Viewstate on the drop down list, and move the binding code without the “!IsPostback” condition to the “OnInit” or “OnPreInit” event handlers

If you implement Option 1, you will reduce the Viewstate alright, but with it, you will also lose the list of countries on the first postback of the page. When the page first loads, the code in the “Page_Load” event handler is executed and the list of countries is bound to the list. However, because Viewstate is disabled on the list, this change of state is not saved during the “SaveViewState” event. When the button on the page is clicked causing a postback, since the binding code is wrapped inside a “!IsPostback” condition, the “LoadViewState” event has nothing saved from the previous page visit and the drop down list is empty. If you implement Option 2, you will reduce the Viewstate size and you will not lose the list of countries on postback. However, another problem arises: because the binding code is now executed at each “Page_Load”, the postback data is lost upon postback, and every time, the first item of the list will be selected. This is true because in the page life cycle, the “LoadPostbackdata” event occurs before the “Load” event. Option 3 is the correct option. In this option, you have done the following:

Disabled Viewstate on the drop down list
Removed the “!IsPostback” condition from the binding code
Moved the binding code to the “OnInit” event handler (or the “OnPreInit” event handler)

Since the “Init” event occurs before the “LoadPostbackdata” in the page life cycle, the postback data is preserved upon postbacks, and the selected item from the list is correctly preserved.

Now, remember that in Option 3, you have successfully reduced the Viewstate size and kept the functionality working; but, this actually comes at the cost of rebinding the drop down list at each postback. The performance hit of revisiting the data source at each postback is nothing when compared with the performance boost gained from saving a huge amount of bytes being rendered at the client’s __VIEWSTATE field. This is especially true with the fact that most clients are connected to the Internet via low speed dial up connections.

ASP.NET Page Life Cycle Demonstration

2008-11-01T17:44:00.000+05:30

Let us take an example ASP.NET page with the following characteristics:

It contains a single Label control (lbl) with its “Text” property set to “statictext”
It contains a Button control (btnA) with code in its event handler that sets the “Text” property of “lbl” to “dynamictext”
It contains a Button control (btnB) whose purpose is to cause a page postback

Now, let us examine what will happen during the page life cycle.

The page is first loaded
1. The compiled class of the page is generated and “statictext” is assigned to “lbl.Text”
2. Tracking for Viewstate is enabled in the “InitComplete” event
3. “LoadViewState” is not fired because there is no postback
4. “SaveViewstate” is fired, but nothing happens because no change of state is recorded
5. The page is rendered with the value “statictext” inside “lbl”
btnA is clicked
1. The previously generated compiled class is handed the request; “lbl.Text” is set to “statictext”
2. Tracking for Viewstate is enabled
3. “LoadViewState” is fired, but nothing happens because no change of state was recorded in the previous page visit
4. “RaisePostbackEvent” event is executed and “btnA” click event handler is fired; “lbl.Text” is set to “dynamictext”; since tracking is enabled at this stage, this item is tracked (marked as “Dirty”).
5. “SaveViewState” is fired; “dynamictext” is serialized and stored in the __VIEWSTATE field
6. The page is rendered with the value “dynamictext” inside “lbl”
btnB is clicked
1. The previously generated compiled class is handed the request; “lbl.Text” is set to “statictext”
2. Tracking for Viewstate is enabled
3. “LoadViewState” is fired; since a change of state was recorded from the previous page visit, __VIEWSTATE is loaded and the value “dynamictext” is extracted; this value is then assigned to “lbl”
4. “RaisePostbackEvent” event is executed; nothing happens here because “btnB” has no event handler for its “Click” event
5. “SaveViewState” is fired, but nothing happens because no change of state is recorded
6. The page is rendered with the value “dynamictext” inside “lbl”

What is an Application Pool?

2008-11-01T15:22:00.000+05:30

When you run IIS 6.0 in worker process isolation mode, you can separate different Web applications and Web sites into groups known as application pools. An application pool is a group of one or more URLs that are served by a worker process or set of worker processes. Any Web directory or virtual directory can be assigned to an application pool.

Every application within an application pool shares the same worker process. Because each worker process operates as a separate instance of the worker process executable, W3wp.exe, the worker process that services one application pool is separated from the worker process that services another. Each separate worker process provides a process boundary so that when an application is assigned to one application pool, problems in other application pools do not affect the application. This ensures that if a worker process fails, it does not affect the applications running in other application pools.

Use multiple application pools when you want to help ensure that applications and Web sites are confidential and secure. For example, an enterprise organization might place its human resources Web site and its finance Web site on the same server, but in different application pools. Likewise, an ISP that hosts Web sites and applications for competing companies might run each companys Web services on the same server, but in different application pools. Using different application pools to isolate applications helps prevent one customer from accessing, changing, or using confidential information from another customers site.

In HTTP.sys, an application pool is represented by a request queue, from which the user-mode worker processes that service an application pool collect the requests. Each pool can manage requests for one or more unique Web applications, which you assign to the application pool based on their URLs. Application pools, then, are essentially worker process configurations that service groups of namespaces.
Multiple application pools can operate at the same time. An application, as defined by its URL, can only be served by one application pool at any time. While one application pool is servicing a request, you cannot route the request to another application pool. However, you can assign applications to another application pool while the server is running.

what is difference between a website and a web application?

2008-11-01T12:15:00.000+05:30

A website is typically available to the public and contains information, images, documents and links. A web application is interactive software that runs within the framework of the website. For example, Google is a website. Searching on Google however is a web application, or mapping on Google is a web application.

Web applications are often linked to databases to capture or display data via a webpage. The key is that the applications can run in a web browser, preferably without installing any other software, and preferably without having to modify firewall or security settings to run.

Difference between batchfiles and windows scripts

2008-10-29T19:05:00.000+05:30

BatchFiles are scripts tooooooo. They let u script a series of tasks, run programs, etc.
1.The major limitation is that they only let us startup programs and dont provide a way to interact with objects.They work at the level of whole programs and files.
2.Scripting is a more and modern approach for windows automation.
3.Scripting languages have the advantages of using control stuctures like loops and decision structures, which the batch script lacks.

Difference between client-side and server-side scripting

2008-10-01T10:59:00.000+05:30

Take the two scripting languages and try to compare between them
Java Script - client-side scripting
PHP - server-side scripting

The difference between these scripts is JavaScript is interpreted by the web browser once the page that contains the script+html has been downloaded. Whereas server-side scripting languages are interpreted by the web server before the page is even sent to the browser. And once it's interpreted, the results of the script replace the server-side scripting language code in the web page itself. i.e., only the output of the script is placed and sent to the web browser and all the browser sees is a standard HTML file.The script is processed entirely by the server, hence the designation: server-side language.

These server-side scripts when executed allow the web developers to control what appears in the browser window more flexibly than what standard HTML do.

Why Scripting?

2008-09-30T14:36:00.000+05:30

scripting is done if there is any repetitive task(such as changing a pwd for a user).You may think of a sqrt() function in a Math library. Because this function is written once and called whereever required. Scripting is much like the same from birds eye view. In scripting there will be much interaction with hardware, kernel services and OS routines.These are used extensively to accomplish a task which internally may involve some series of tasks.The following def will give you a clear picture abt scripting "A program containing series of commands(services/other commands/etc) arranged accordingly to accomplish a goal" is called a script

play with ur browser

2008-09-29T19:16:00.000+05:30
hey try these

1)
ctrl + + keep pressing this

To restore changes ctrl + 0(zero)

you can try this in mozilla, IE, chrome, safari

2)
press F11 to view your window in fullscreen mode

measure ur browser memory

2008-09-29T15:57:00.000+05:30
Hey i found this new thing with my chrome browser
It has an intresting feature which helps you to look at the memory limit occupations of all the browsers installed on ur machind.
Just open the chrome browser window. On the top of the window just right click and open taskmanager.
You can see a small taskmanager window where you have to select the chrome browser window and at the bottom click on the 'stats for neds' you will see a new tab which will list the memory usage of all the currently opened browsers.......

Have a nice day:)

Intro to silverlight

2008-09-29T15:31:00.000+05:30
Silverlight
An added piece of program for the browser(IE) that extends its functionality. Extending the functionality means user can have more real experience with the browser.Its a microsoft product - so by default it will(& should) work on IE browsers. Other browsers do support this technology.Few are Firefox and safari.
Last but not the least silverlight is a client-side technology.

what are plug-ins?

2008-09-29T15:26:00.000+05:30
Plug-ins are software pieces that enhances the functionality of the existing software. For ex you can add plug-ins to your browser so that you can view files in a different(new) formats.
There are also plug-ins for graphic programmes.
The term plug-ins is used in conjuction with browsers mostly because browsers will keep on upgrading!!!!!

what is managed && unmanaged code?

2008-09-29T12:59:00.001+05:30
As far as my knowledge the following statements will help you to differentiate between managed & the unmanaged code:

As the name unmanaged code implies the code is completely not in control which indirectly tells us that its a third party software. You are executing a third party software on ur machine and you dont know how it works but yet it works exhibiting its interface to the outside world.

managed code in other words are generated by ur machine - for example a simple c++ program compiled by a borland compiler will generate a file which can be run directly on the same machine. Here the compiler has generated the output(infact it created the origin) where by we can say that the output is managed code for the compiler.
If you wrap this code into an exchangable component(like a dll) and give it to someone else your code will be unmanaged code to the machine which uses your code.
Ex: - Internet Explorer is an example of unmanaged code bcoz it can run .aspx files written and compiler by the .net framework

static in java and c#

2008-09-21T14:46:00.000+05:30
Java:
In java if you don't wanna create an instance of a class. Simply put a private constructor in that class.

C#
In C# also u can follow the same approach but the .net platform provides a simple feature called static class.Look at the following code:

static class MyClass
{
static void hello()
{
Console.WriteLine("Hello World");
}
}
This class can only contain static data.

Note: You can't find static classes in java

Instructions to keep in mind before developing an application

2008-09-20T17:34:00.000+05:30
1. Is it needed?
2. Where to start(Either bottom-up/top-down approach)?
3. Naming conventions
4. Is it extensible -- i.e., will it work for n
5. Reusability - can ur code will be used elsewhere?
6. Am i writing like a good programmer?
7. Performance issues - will it upgrade/degrade performance

Some Facts

2008-09-19T11:39:00.006+05:30
1. Honey is the only food that won't spoil

2.Bullet proof vests, fire escapes, windshield wipers and laser printers they have one thing common
----- they are invented by women
3. pig cannot look up into the sky

4. Butterflies taste with their feet

5.stewardesses is the only word that can typed with left hand

6. Rats multiply so quickly that in 18 months, two rats can have millions have of descendants

7. The ciggarette lighter was invented before the match box.

8. Elephants are only animals that cant jump

9.If a statue of a person in the park on a horse has both front legs in the air, the person died in battle.
If the horse has one front leg in the air, theperson died as a result of wounds received in battle.
If the horse has a all four legs on the ground, the person died of naturalcauses.

10. The strongest muscle in the body is tounge

Tips to remember

2008-09-19T11:39:00.005+05:30
The most important for a any programmer/software professional is
"knowing how to find what you need, when you need it"

C# - Access specifier for methods

2008-09-19T11:39:00.004+05:30
If you wirte a function in a class and dont specify any access specifier for that class, then the default access for that function is Private. Which implies that it is not accessible to any class(either child class or not) within that namespace or outside that namespace.

If you want everyone to access that function give it public access. If you want only child classes to access that function give it protected access.

Note:If you gave public access for that function and there default access for the containing class then you will not have access for that public function outside the namespace. This is because you have opened the room door(function is public) but u haven't opened the main door(class not public) for pupil outside the namespace

Display table data in reverse order

2008-09-19T11:39:00.003+05:30
Very rarely you can get into a situation where u want to show the table data in a reverse order i.e., last row displayed first, 2nd row will be last but one and so on....

The first thing that comes into mind for such a query is user order by with desc/asc.
But watch out baby in every case you cannot use order by. Even if u use, it might not show u the desired result.So what to do????????

Here is your solution

SELECT ROWID AS temp, * FROM emp ORDER BY temp DESC;

Dont forget to check out this stmt guyzzzzz

c# - Access levels within namespace

2008-09-19T11:39:00.001+05:30

Class Constructor Another Class
default default not accessible(cannot
create object)main door(class) is default opened
for others within namespace but not
the room door(constructor)
so they cannot open it.

default public accessible(can create object) - main
door(class) is default opened for others and you
have opened room door(constructor) also so
accessible.

public default not accessible - you made main door(class)
open not only for classes within the namespace but
also for others outside the namespace but you have
not opened the room doors so on one can access it.

public public accessible - Yep Congratulations you have
opened the main
door and also the room door so its accessible.

Caution: Be careful you can loose privacy in the last case

Hi

2008-09-18T11:13:00.000+05:30
This is my first experience writing something on the net n i m very nervous doing this.
Firstly i vud like to say "Hi" to everyone