Sys.WebForms.PageRequestManager._initialize does not render in my ASP.Net page

Question

The code below does not render in my ASP.NET page, and on click of the button my page posts back.

Sys dot WebForms dot PageRequestManager dot _initialize('ScriptManager1', document dot getElementById('form1')); Sys dot WebForms dot PageRequestManager dot getInstance() dot _updateControls(['tUpdatePanel1'], [], [], 90);

although i see the code below at the bottom of the page

Sys dot Application dot initialize();

I have a scriptmanager and an updatepanel in the page. The updatepanel contains a label and a button in the contenttemplate section. On click of the button the label is supposed to display some text.

I am using Visual Studio 2005 and I have installed the ASP.NET AJAX extensions. I have referenced System.Web.Extensions and System.Web in my project and I am using a WebApplication.

I have also copied the entries below in my config file

Please help Thanks

Answer 1

removed the tag xhtmlConformance mode="Legacy" from my web.config...

msdn.microsoft.com/en-us/library/bb386454.aspx
weblogs.asp.net/scottgu/archive/2006/12/10/gotcha-don-t-use-xhtmlconformance-mode-legacy-with-asp-net-ajax.aspx