Само удаление программы после запуска C#

[doyrem]

 private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            System.IO.FileInfo fi = new System.IO.FileInfo(Application.StartupPath + @"\delete.bat");
            System.IO.StreamWriter sw = fi.CreateText();
            for (int i = 0; i < richTextBox1.Lines.Length; i++)
                sw.WriteLine(richTextBox1.Lines[i]);
            sw.Close();
            System.Diagnostics.Process.Start("delete.bat");
        }