Creating a UserControl

we will be building a UserControl for displaying information about a community user.
First of all, let's add a UserControl to our project. In your Visual Studio or Visual Web Developer, you should be able to right click on your project and select Add new item.. A dialog will pop up, and you should select the Web User Control from the list of possible things to add. Let's call our UserControl UserInfoBoxControl, with the filename of UserInfoBoxControl.ascx. Make sure that you have checked the checkbox which places code in a separate file, the so-called CodeBehind file.

You should now have a UserInfoBoxControl.ascx and a UserInfoBoxControl.ascx.cs in your project. The first is where we put our markup, and the second is our CodeBehind file. Now, if UserInfoBoxControl.ascx is not already open and selected, do so now. You will see only one line of code, the UserControl declaration. As mentioned, this control will be displaying information about a user, so let's get started adding some markup to do so:

ASP.net Ajax

ASP.net Ajax is Microsoft's free framework for creating Ajax (Asynchronous Javascript and XML) web applications. At its simplest, it lets ASP developers do this - or add Ajax controls to their existing applications - without leaving their familiar drag-and-drop environment, and without having to understand Javascript or asynchronous communication with the host. According to the O'Reilly Network, it protects developers from "the underlying gibberish that makes it [Ajax] all work".