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Project Description
The Callback is among the novelties of the ASP. Net 2.0.
shows the power of callback combined with javascript methods can make the application more lighter.
update a specific control in the page and not the entire page without using AJAX

Complete Article @ CodeProject:


In this article, I present another aspect of communication in the Asp. Net 2.0, named "CallBackā€ and how it can be used for a web application soft light and especially preformative.

For this I created a set of "WebControls" based on the "CallBack" not on "PostBack" but that works exactly like the standard controls of 2.0

I will first start by explaining important concepts for understanding the article and finally I'll show you an example in practice

CallBack ?

The Callback is among the novelties of the ASP. Net 2.0, it can communicate with the server without posting the whole page ..

The difference between Callback and postback is that in the PostBack whenever you click a button, all the HTML of the page and its controls is regenerated (Render).
By cons in the callback is not the case and it is very important! Why regenerate all the HTML page? Is it important to do? when I just want to add a row in my GridView (for example).

So for a web application slightly, the "Render" of a control should be targeted and not overall ..

I mean no need to generate all the html code of the page and its controls.

You can use "Ajax control" but I do not know the code generated behind, so I can control what happens in my application.


In this Demo there is 4 controls in the page, each of them update another standard control:

  • AEDropDownList changes the backcolor of the button
  • The AEbutton (Check/Incheck) the Checkbox
  • The AEChechbox makes the Textbox Readonly
  • The AETextbox changes the Text of the button

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