an unknown error has occurred while processing the request on the server. the status code returned from the server was 500

Hi All,

Can you help me resolve this issue on button click?

an unknown error has occurred while processing the request on the server. the status code returned from the server was 500
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Pawan KumarDatabase ExpertCommented:
What code you have written? Can you please share.
Ryan ChongCommented:
server was 500
most likely your server got an error and failed to generate a response

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akoITAuthor Commented:
Hi Pawan thanks for response. Here is the sample code.

I have a button and an gridview inside update panel.

<asp:UpdatePanel ID="sample" runat="server" >

       <button type="button" runat="server" onclick="javascript: LoadingModal();" onserverclick="GenerateReport" />

     <asp:GridView ID="gridViewRpt" runat="server">

 </ contentTemplate>


Protected Sub GenerateReport(sender as object, e as EventArgs)
gridViewRpt.DataSource = cmd.ExecuteReader()
End Sub

when i click the button on the first time, there is no error, but when i click it again this error is occured.
akoITAuthor Commented:
Hi Ryan Chong, how can I prevent this kind of error?
Ryan ChongCommented:
how can I prevent this kind of error?

try to verify what's the exact error generated from server end...

for example, if you can't just-in-time debugging... try do a try catch in Sub GenerateReport and send that error into a custom log file for debugging.

Just-In-Time Debugging in Visual Studio

for the custom log, we usually use log4net library which you can get from NuGet Manager.

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