Ajax Enabled Web application

HI,

 I have created web application successfully, But i cannot use AJAX in it,What i
have to do for creating AJAX ENABLED WEB APPLICATION

start from the beginning...

1. have you installed ajax on your machine and then set up the controls in
visual studio? 

follow this tutorial: http://asp.net/learn/ajax-videos/

first you need to install the version of the ajax extensions that correspond to
the version of visual studio/.net that you're running. If you're developing in
asp.net 2.0 then you need the extensions 1.0. If you are on Visual studio 2008
and running on the .net framework 3.5 then you need the 3.5 version.

Once you have this installed, it will create an application template that you
can choose from  your new project dialog in visual studio. It will say something
like "AJAX Enabled Web Site".
 

After that I'd suggest going to check out the control toolkit for added
benefits.

I have installed AJAX and i used it for asp.net websites already, But now i
cannot use this for web Application

okay so if I'm understanding correctly this is an application that has already
been created as not ajax enabled?

this might be of some help then 

Sorry for misunderstanding your question the first time around