VB.Net 3.5 Check if file is in use

Question

I have an update program that is completely independent of my main application. I run the update.exe to update the app.exe. To check to see if the file is in use, I move it

Answer 1

This is what I ended up doing. The network scan did not work on a peer-to-peer network. It didn't resolve the other computers at all.

Anyhow, here it is:

Private Sub CheckFileIfFileIsInUse(ByVal thefilename As String)
Try
' on the Vista OS you can rename a file that is in use
' the 'in use' of the original file follows the new file name

      Dim testfile As String = thefilename & ".tst"


      If IO.File.Exists(testfile) Then

          IO.File.Delete(testfile)

      End If


      ' so we have to rename it to something else

      IO.File.Move(thefilename, testfile)


      ' copy it back to the original file name in case something 
breaks 
      ' this just keeps them in working order if it does

      IO.File.Copy(testfile, thefilename)


      ' then we try to delete the original file that could be in use 

      ' which will return an 'in use' error at this point

      If IO.File.Exists(testfile) Then

          IO.File.Delete(testfile)

      End If


  Catch ex As Exception

      'throw it to the originating method

      Throw

  End Try

End Sub

Hope this helps the next person.