using System;

using System.Drawing;

​

public class Program

{

    public static void Main()

    {

      Point point1 = new Point(20, 30);

      Point point2 = point1;

      point2.X = 50;

      Console.WriteLine(point2.X);       

      Pen pen1 = new Pen(Color.Black);

      Pen pen2 = pen1;

      pen2.Color = Color.Blue;

      Console.WriteLine(pen1.Color);     

    }

​

}