Different characters of DELEGATE REFERENCE

Question

You will notice in the 1^st example delegate reference is remaining as it is. In the 2^nd example same delegate reference "del" has become method. In 3^rd example delegate reference "del" has become a parameter.

What I wish to know is whether this is uniquness to delegate reference only.  

Eg1

using System;

delegate void MyDelegate();

class Program

{

    static void Main(string[] args)

    {

        MyDelegate del = new MyDelegate(SayHello);

        del.Invoke();//Delegate reference "del" is remaining as it is

    }

    static void SayHello()

    {

        Console.WriteLine("Hey there!");

    }

}

 Eg2

using System;

delegate void MyDelegate();

 class Program

{

    static void Main(string[] args)

    {

        MyDelegate del = SayHello;

        del();//Delegate reference "del" has become method

    }

    static void SayHello()

    {

        Console.WriteLine("Hey there!");

    }

}

Eg3

using System;

 delegate void MyDelegate();

class Program

{

    static void Main(string[] args)

    {

        MyDelegate del = SayHello;

        Test(del);//Delegate reference "del" has become a parameter

    }

    static void SayHello()

    {

        Console.WriteLine("Hey there!");

    }

    static void Test(MyDelegate del)

    {

        del();

    }

}