'Sys' is undefined while using asp.net update panel

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i'm getting 'Sys' is undefined error while using update panel of asp.net.
can anyone let me know why this is happening.
i was also using jquery in same project.

thanks in advance.

Posted 30-May-12 20:34pm

preet88

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Sandeep Mewara · Accepted Answer · 2012-05-30T21:46:00

If you use VS2005 the problem is generally because of web.config configuration. Add the following configuration in web.config in system.web section.

HTML

<httpHandlers> <remove verb="*" path="*.asmx"/>
            <add verb="*" path="*.asmx" validate="false" type="System.Web.Script.Services.ScriptHandlerFactory"/>
            <add verb="GET,HEAD" path="ScriptResource.axd" type="System.Web.Handlers.ScriptResourceHandler, System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" validate="false"/>
        </httpHandlers>

If you use VS2008, the problem is generally because of JavaScript that references the Sys namespace too early.

Here, have a look at these articles and blog posts discussing the same and how to resolve it:
Configuring ASP.NET AJAX[^]
ASP.NET - AJAX functionality not working on the page | Getting ‘Sys’ is undefined[^]
How to solve "sys is undefined" error while using asp.net ajax update panel. [^]
Updated your web.config, but Sys is still undefined?[^]
'Sys' is undefined - ASP.NET AJAX[^]
ASP.NET AJAX 3.5 error - “Sys is undefined” workaround[^]