如果它不能运行combox列表索引中的内容，我就无法退出我的VB.net应用程序

Question

下面是我自己编写的程序代码段，进度条达到100％时无法退出程序；检查组合框中所选索引中是否有有效文件要运行之后。

Private Sub CheckIfRunning()
    p = Process.GetProcessesByName(ComboBox1.SelectedIndex = TabIndex)
    If p.Count > 0 Then
        ' Process is running
        Else
           Dim did_an_oopsie As DialogResult = Form3.ShowDialog
           If did_an_oopsie = Form3.ProgressBar1.Value = 100 Then
               Close()
           End If
           Try
               Process.Start(System.IO.Path.Combine(
         AppDomain.CurrentDomain.BaseDirectory,ComboBox1.SelectedIndex = TabIndex))
            Catch ex As Exception
            End Try
    End If
End Sub