protected virtual void OnMyTestCallBackEvent(MyTestCallBackEventArgs e)
 {
     if (MyTestCallBackEvent != null)
     {
         MyTestCallBackEvent(e);
     }
 }
 private callback_MyTestCallBackEvent(MyTestCallBackEventArgs e)
 {
     // TODO: Invoke code here with e.g. label1.Text = e.SomeObj.ToString()...
 }