void WCF_DeleteEventCompleted(object sender, DeleteEventCompletedEventArgs e)
 {
     if (e.Result == true)
     {
         MessageBox.Show("Event has been deleted");
         tabControl.SelectedItem = tabManage;
         tabDelete.Visibility    = Visibility.Collapsed;
         WCF = new WebService.Service1Client();
         WCF.retrieveEventAsync(lblEvenName.Content.ToString());
         WCF.retrieveEventCompleted += new EventHandler <retrieveEventCompletedEventArgs>(WCF_retrieveEventCompleted);
     }
     else
     {
         MessageBox.Show("Error in deleting event");
     }
 }
 private void es_DeleteEventCompleted(object sender, DeleteEventCompletedEventArgs e)
 {
     if (e.Error == null)
     {
         if (e.Result)
         {
             MessageBox.Show("Event Deleted");
         }
         else
         {
             MessageBox.Show("Event Delete Error");
         }
     }
     else
     {
         MessageBox.Show("Event Delete Error " + e.Error.Message);
     }
 }