Can you pass value types by reference to a method?

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;



namespace Sample

{

    class Program

    {

        public static void Main()

        {

            int a = 10;

            Console.WriteLine("Value of a before passing to the method = " + a);

            Function(ref a);

            Console.WriteLine("Value of a after passing to the method by reference= " + a);

         }

         public static void Function(ref int Num)

         {

             Num = Num + 5;

         }

     }

}