using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        var myThing = new MyThing();

        myThing.MyGuid = Guid.Parse("343ba61a-59dc-44ba-94de-9ccce4c3f3ab");

        // myThing.MyGuid = null;  // compile error

    }

}

​

public class MyThing

{

    public Guid MyGuid {

        get { return Guid.NewGuid(); }

        set { 

            Console.WriteLine(value.GetType());

            if(value == null) // how does this compile

            { 

                Console.WriteLine("its null bro"); 

            } 

        }

    }

}