RefTest

Program.cs

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

namespace RefTest
{
    class SomeClass
    {
        public int SomeProperty { get; set; }
    }
    class Program
    {
        static void Main(string[] args)
        {
            var sc = new SomeClass();
            sc.SomeProperty = 1;
            var oldValue = sc.SomeProperty;
            ModifyProperty(sc);
            Console.WriteLine("Property changed: {0}", oldValue != sc.SomeProperty);
        }

        static void ModifyProperty(SomeClass sc)
        {
            sc.SomeProperty++;
        }
    }
}