Behind code running but not working

Hi People,
Something strange. I have a button which executed (in the behind code) an stored procedure to add some data to my database. So far so good. When this is done , a report need to be exported, but when I do, the rest of my code is not working anymore... This works as it should;
           ''start export report here                 'Dim report As New rpt_ReceptPreview()                 'Dim stream As New MemoryStream()                 'Response.Clear()                 'report.ExportToPdf(stream)            &nbs ...