System.ArgumentException Assistance Needed... [modified]

[new_phoenix 0]

Hello, guys!! I am working with an application that uses a try-catch block inside a DragOver Event handler. The problem is that there is an Argument Exception that occurs when a control is dragged. Technically, it is a circular reference. When this Argument Exception occurs, both controls disappear, and the ArgumentException handler catches the error. The question is, how do I get the Exception handlers to prevent the code from running, thereby preventing the controls from disappearing? Is there a way of trapping the condition that causes the ArgumentException so that the controls would not disappear because of the error? Here is the code:

	private static void \_ctrlParent\_DragOver(object sender, DragEventArgs e) 
	{
		try
		{
			if (DragDropHandler.CanDropHere((Control)sender, e.Data))
			{
				// Control dragged to
				Control cthis = (Control)sender;
				// Control dragged
				CardControl ctrl = (CardControl)DragDropHandler.GetControl(e.Data, true, true);
				e.Effect = DragDropEffects.Move;				

				if (!(ctrl is IDragDropEnabled))
				{
					return;
				}
				if (cthis.Name != ctrl.Name)
				{
					if ((ctrl.HasChildren == false) && (ctrl.blnCardFaceStatus==true) 
						|| ((ctrl.HasChildren == true) && (ctrl.blnCardFaceStatus=true)))
					{
						//MessageBox.Show("cthis is " + cthis.Name + " and ctrl is " + ctrl.Name);
						ctrl.Parent.Controls.Remove(ctrl);
						ctrl.Parent = cthis;   // Here is where the circular reference occurs.
						cthis.Controls.Add(ctrl);
						ctrl.BringToFront();
					}
					else if ((ctrl.HasChildren == true) && (ctrl.blnCardFaceStatus==false)
						|| ((ctrl.HasChildren == false) && (ctrl.blnCardFaceStatus=false)))
					{
						return;
					}
				}
				else
				{
					return;
				}
				Point NewLocation = cthis.PointToClient(new Point(e.X, e.Y));
				ctrl.Left = NewLocation.X - dragPoint.X;
				ctrl.Top = NewLocation.Y - dragPoint.Y;
			}
			else
			{
				e.Effect = DragDropEffects.None;
			}
		}
		catch (System.ArgumentException)
		{
			MessageBox.Show("Argument Exception Error");
		}
	}

modified on Monday, December 24, 2007 8:12:20 PM