public static void CoverianceDelegateExample()
{
var ra = new RectangleArea();
var ta = new TriangleArea();
var covDlg = new CoverianceDelegate(ra.GetRectArea);
covDlg();
covDlg = new CoverianceDelegate(ta.GetTrgArea);
covDlg();
}
public static void PassingRectArea(RectangleArea obj)
{
Console.WriteLine("RectangleArea object is passed to this method.");
}