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Saturday, May 7, 2011

Using Response.Redirect and Response.End in Try...Catch block

In ASP.NET if you are using Response.End - Used for terminating page execution or Response.Redirect - used for redirecting page to some other page, and you are including these statements in TRY... CATCH block here is what you need to remember.

Problem:

When Response.Redirect or Response.End is written in TRY block, code in catch block is executed.

Reason:

ASP.NET executes these 2 methods on Response object by throwing ThreadAbort Exception. When written in simple Try...Catch block this results in Catch block catching this exception and processing code written in catch block. This causes unwanted code execution e.g. error logging or genric error display code which is generally written in Catch block.

Solution:

You need to handle ThreadAbort exception separately and do nothing if it is thrown. Refer following code patch:

try
{
// Your actual code

Response.End();
}
catch (ThreadAbortException exc)
{
// This should be first catch block i.e. before generic Exception
// This Catch block is to absorb exception thrown by Response.End
}
catch (Exception exc)
{
// Write actual error handling code here
}

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