Private Sub btnStart_Click(ByVal sender As System.Object, ByVal e As _
  System.EventArgs) Handles btnStart.Click
        Dim startmadplay As Process
 
        startmadplay = Process.Start("Progs\madplay.exe" & " " & _
          txtMadplay.Text & "madtemp" & ".wav" & " " & StrDateiliste)
        startmadplay.WaitForExit()
    End Sub