using System;
using System.Collections.Generic;
using System.Text;
namespace ParamsRefOut
{
  class Program
  {
    static void ChangeValue(int i)
    {
      i=5;
      Console.WriteLine("The ChangeValue method changed the value "+i.ToString());
    }
    static void Main(string[] args)
    {
      int i = 10;
      Console.WriteLine("The value of I is "+i.ToString());
      ChangeValue(i);
      Console.WriteLine("The value of I is " + i.ToString());
      Console.ReadLine();
    }
  }
}

using System;
using System.Collections.Generic;
using System.Text;
namespace ParamsRefOut
{
  class number
  {
    public static void UseParams(params int [] list)
    {
      for(int i=0;i<list.Length;i++)
      {
        Console.WriteLine(list[i]);
      }
    }
    static void Main(string[] args)
    {
      UseParams(1,2,3);
      int[] myArray = new int[3] {10,11,12};
      UseParams(myArray);
      Console.ReadLine();
    }
  }
}

using System;
using System.Collections.Generic;
using System.Text;
namespace ParamsRefOut
{
  class number
  {
    static void Main()
    {
      int val = 0;
      Method(ref val);
      Console.WriteLine(val.ToString());
    }
    static void Method(ref int i)
    {
      i = 44;
    }
  }
}