AJAX不能在ASP.NET中工作

I have .NET 4.0 and .NET 2.0 installed in my computer I tried running a AJAX.NET application with Asynchronous Triggered Timer Tick function and my page is reloading i.e. (Asynchronouspostback is not working). I tried changing my App Pool to I have .NET 4.0 and .NET 2.0 installed in my co