C#

private static void _ctrlParent_DragOver(object sender, DragEventArgs e)
{
	if (DragDropHandler.CanDropHere((Control)sender, e.Data))
	{
		Control cthis = (Control)sender;
		e.Effect = DragDropEffects.Move;
		Control ctrl = DragDropHandler.GetControl(e.Data, true, true);

		try
		{
			if (!(ctrl is IDragDropEnabled))
			{
				return;
			}
			if (cthis.Name != ctrl.Name)  // attempt to prevent a circular control reference in which a control may potentially refer to itself as a parent.
			{
				ctrl.Parent.Controls.Remove(ctrl);
				ctrl.Parent = cthis;
				cthis.Controls.Add(ctrl);
				ctrl.BringToFront();

				// this is the place where the dragPoint needs to be resampled more often because the cursor needs to touch the form before dragging occurs.	
				Point NewLocation = cthis.PointToClient(new Point(e.X, e.Y));
				ctrl.Left = NewLocation.X - dragPoint.X;
				ctrl.Top = NewLocation.Y - dragPoint.Y;
			}

					
		}
		catch (System.Exception ex)
		{
			MessageBox.Show("Here is the DragOver Error: " + ex.Message + " The ctrl.Name is " + ctrl.Name + " and cthis is " + cthis.Name);
		}
	}
	else
	{
		e.Effect = DragDropEffects.None;
	}
}