C# - Error With Content-disposition?

May 17, 2010

how should I handle an exception that occurs after sending a Content-Disposition header for an attachment? I'm trying to generate a report at server and send it as a file, but if an exception occurs during the report generation, the error message itself is sent to browser which still takes it as a content of a file and shows a Save As dialog. User cannot know there was an error generating report, saves the file which is in wrong format now.Is there a way to cancel the response with this header and redirect to an error page? Or what else can I do to inform user about the error?

Probably I could generate the report first and only if there was no error send the headers, but I want the report render directly to the Response output stream so that it does not need to stay in memory.

Here is my code:

this.Response.ContentType = "application/octet-stream";
this.Response.AddHeader("Content-Disposition", @"attachment; filename=""" + item.Name + @"""");
GenerateReportTo(this.Response.OutputStream); // Exception occurs

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