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

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 e开发者_如何学Pythonntries below in my config file

Please help Thanks

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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

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I have a similar issue. Its solved by using The real problem is I have used tdXXXXX = de('_ctl0_CPB_XXXXX');

where de is a function function de(clID)

    {
        return document.getElementById(clID);  
    }       

Previously the control was rendered correctly as _ctl0_CPB_XXXXX, now it has appeneded an extra 0 ie. _ctl00_CPB_XXXXX. This is used throught the application, and its causing the javaScripts failures. Any solutions.