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22.

23. PrivateSub ButtonDownload_Click(ByVal sender As System.Object,ByVal e As System.EventArgs)

Handles ButtonDownload.Click

24. Dim sFilePath AsString

25. Dim buffer AsByte()

26. Using conn AsNew SqlConnection("Data Source=apex2006sql;Initial Catalog=Scott;Integrated

Security=True;")

27. conn.Open()

28. Using cmd AsNew SqlCommand("Select Top 1 PDF From PDF", conn)

29. buffer = cmd.ExecuteScalar()

30. End Using

31. conn.Close()

32. End Using

33. sFilePath = System.IO.Path.GetTempFileName()

34. System.IO.File.Move(sFilePath, System.IO.Path.ChangeExtension(sFilePath,".pdf"))

35. sFilePath = System.IO.Path.ChangeExtension(sFilePath,".pdf")

36. System.IO.File.WriteAllBytes(sFilePath, buffer)

37. Dim act As Action(Of String)=New Action(Of String)(AddressOf OpenPDFFile)

38. act.BeginInvoke(sFilePath,Nothing,Nothing)

39. EndSub

40.

41. PrivateSharedSub OpenPDFFile(ByVal sFilePath)

42. Using p AsNew System.Diagnostics.Process

43. p.StartInfo =New System.Diagnostics.ProcessStartInfo(sFilePath)

44. p.Start()

45. p.WaitForExit()

46. Try

47. System.IO.File.Delete(sFilePath)

48. Catch

49. EndTry

50. End Using

51. EndSub

52. EndClass

The OpenPDF method is launched in another thread so it can wait for the process to terminate then clean up the temporary PDF file

written to disk.

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