using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace StackAndHeapStudy
{
    unsafe class Program
    {
        static void Main(string[] args)
        {
            var test = new TestClass();
            SetX(test);
            Console.WriteLine(*test.X);
            Console.WriteLine(*test.X);
        }

        private static void SetX(TestClass test)
        {
            var X = 10;

            test.X = &X;
        }
    }

    unsafe class TestClass
    {
        public int* X;
    }
}