.net open pdf in client browser doesn't work...

Hi
I have a vb.net app that is required to open a pdf when the user clicks a link in a gridview..
The handler in the rowCommand event for the gridview fires, but I can't get the pdf to actually open...

This one is driving me nuts....

Error =  "The thread was being aborted"

If I comment out the "Response.end()" there's no error, but no document opening either...
Here's the relavent code snippet....

Try
                    Dim client As New WebClient()
                    Dim buffer As [Byte]() = client.DownloadData(strFileName)
                    Dim fileName As String = "EmploymentContract.pdf"
                    Response.Buffer = True
                    Response.Clear()
                    Response.ContentType = "application/pdf"

                    Response.AddHeader("content-length", buffer.Length.ToString())
                    Response.BinaryWrite(buffer)
                    Response.End()

                Catch ex As Exception
                    Session("errorMessage") = "FileName = " & strFileName & " -- " & ex.Message
                    Response.Redirect("errorPage.aspx")
End Try

Select all Open in new window

I've tried it in both Chrome (preferred) and IE with the same results...
If I manually paste the file path into chrome the pdf opens without a hitch..

Can anyone shed any light on this please?

Thasnks in advance..

Dave