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

Question

I have written a block of code to download pdf file. but i m getting following exception in Response.End()

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

what can be done to solve this problem??

Archi Gaikwad · Answer

Thanks Nipun But When i use HttpContext.Current.ApplicationInstance.CompleteRequest() method insted of Response.End() i do not get exception but the pdf file does not get downloaded...

James Tomar · Answer

Are you debugging with mixed mode? To work around this problem use one of the following methods: For Response.End  call the HttpContext.Current.ApplicationInstance.CompleteRequest method instead of Response.End to bypass the code execution to the Application_EndRequest event. For Response.Redirect  use an overload Response.Redirect(String url bool endResponse) that passes false for the endResponse parameter to suppress the internal call to Response.End . For example: Response.Redirect (nextpage.aspx false); If you use this workaround the code that follows Response.Redirect is executed. For Server.Transfer  use the Server.Execute method instead. http://support.microsoft.com/kb/312629/EN-US/