C# - 按引用传递

using System;
namespace CallByReference
{
    class Program
    {
        // 用户定义的函数
        public void Show(ref int val)
        {
             val *= val; // Manipulating value
            Console.WriteLine("Value inside the show function "+val);
            // No return statement
        }
       
        static void Main(string[] args)
        {
            int val = 50;
            Program program = new Program(); // 创建对象
            Console.WriteLine("Value before calling the function "+val);
            program.Show(ref val); // 通过引用来调用函数    
            Console.WriteLine("Value after calling the function " + val);
        }
    }
}