Cannot redirect after HTTP headers have been sent.

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ASP.NET

after generate report redirecting to new page.(this i have to do )

so, report is generated but gives me error Cannot redirect after HTTP headers have been sent.

here is my code....

view_report(); //gets records  from database.
       try
       {
           Rpt.ExportToHttpResponse(ExportFormatType.Excel, Response, true, "Summary Report");


       }
       catch (Exception ex)
       {
           Console.WriteLine(ex.Message);
           ex = null;
       }
       finally
       {
           Response.Redirect("~/MessagePage.aspx",false);
       }

so i want both
generate report and redirecting to new page.