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Are you using AJAX UpdatePanel?<br />
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<a href="http://weblogs.asp.net/leftslipper/archive/2007/02/26/sys-webforms-pagerequestmanagerparsererrorexception-what-it-is-and-how-to-avoid-it.aspx" rel="ugc">http://weblogs.asp.net/leftslipper/archive/2007/02/26/sys-webforms-pagerequestmanagerparsererrorexception-what-it-is-and-how-to-avoid-it.aspx</a><br />

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Are you using AJAX UpdatePanel?

http://weblogs.asp.net/leftslipper/archive/2007/02/26/sys-webforms-pagerequestmanagerparsererrorexception-what-it-is-and-how-to-avoid-it.aspx [http://weblogs.asp.net/leftslipper/archive/2007/02/26/sys-webforms-pagerequestmanagerparsererrorexception-what-it-is-and-how-to-avoid-it.aspx]


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Yes...and I also cannot update a label which is outside of the updatepanel. 
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Yes...and I also cannot update a label which is outside of the updatepanel.

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Trying to learn how to do exception handling in .net c#. I wanted to just raise an error to the page but get the error below when I try this statement. Can anyone tell me why? How can I simply display the error (preferrably in a message box) on a web form? <br />
<br />
&nbsp;catch (Exception ex)<br />
&nbsp; &nbsp; &nbsp; &nbsp; {<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Response.Write(ex.Message)<wbr />;<br />
&nbsp; &nbsp; &nbsp; &nbsp; } &nbsp;<br />
<br />
<br />
Microsoft JScript runtime error: Sys.WebForms.PageRequestMa<wbr />nagerParse<wbr />rErrorExce<wbr />ption: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.
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Trying to learn how to do exception handling in .net c#. I wanted to just raise an error to the page but get the error below when I try this statement. Can anyone tell me why? How can I simply display the error (preferrably in a message box) on a web form? 

 catch (Exception ex)
        {
           Response.Write(ex.Message);
        }  


Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.

Response.write exception in try catch statement

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.

.NET Programming

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).