using System;

using System.Reflection;

using System.Linq;

​

public static class MyClassStatic

{

    public static void Method2(this MyClass obj)

    {

        Console.WriteLine("You have called ex Method 2");

    }

}

​

public interface IClass

{

    void Method1();

}

​

public class MyClass : IClass

{

    public void Method1()

    {

        Console.WriteLine("You have called Method 1");

    }

}

​

public class Program

{

    public static void Main()

    {

        var myClass = new MyClass();

        var whereMethods = typeof (MyClassStatic).GetMethods(BindingFlags.Static | BindingFlags.Public).FirstOrDefault(mi => mi.Name == "Method2");

        whereMethods.Invoke(null, new object[]{myClass});

    }

}