using System;

public class Program

{

    public static void Main()

    {

        object o2 = null;  

        try  

        {  

            int i2 = (int)o2;   // Error  

        }

        catch (System.NullReferenceException e)   

        {  

            Console.WriteLine("Catch 1: This cast is not possible");

        }  

        catch (System.InvalidCastException e)

        {

            Console.WriteLine("Catch 2: This cast is not valid");

​

        }

    }

}