Exception: Unable to evaluate expression…

I was working with the following code, the tail end of code which allows the user to download a file:

try
{
Response.ContentType = "text/plain";
Response.AddHeader("Content-Disposition", "attachment;filename=" + FileName + ".dat");
Response.ClearContent();
Response.Buffer = true;
Response.Write(objBuilder.ToString());
Response.End();
}
catch (Exception e)
{
 // Stuff
}

While running through this code, I received and exception at the Response.End line:

Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack

Luckily, I ran cross a very useful post on the ASP.NET forums which pointed to the exact problem. I took out the try-catch block and that solved the issue.

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