private void btn_AddClo_Click(object sender, EventArgs e)
 {
     Clo.getInstance().Show();
     Clo.getInstance().Refresh();
     Clo.getInstance().Location = this.Location;
     this.Close();
 }
 public static Clo getInstance()
 {
     if (instance == null)
     {
         instance = new Clo();
     }
     return(instance);
 }