using System;

​

public delegate A DoSomething();

public class A

{

    public int value

    {

        get;

        set;

    }

}

​

public class B : A

{

}

​

public class DelegateCovariance

{

    public static A WorkA()

    {

        A a = new A();

        a.value = 1;

        return a;

    }

​

    public static B WorkB()

    {

        B b = new B();

        b.value = 2;

        return b;

    }

​

    public static void Main(string[] args)

    {

        Console.WriteLine("Delegate Example\nCovariance\nEduardo Isaac Ballesteros Muñoz\n");

        A someA = new A();

        DoSomething something = WorkB;

        someA = something();

        Console.WriteLine("The value is " + someA.value);

    }

}