Pass value by reference with read only value

/*
Learning C# 
by Jesse Liberty

Publisher: O'Reilly 
ISBN: 0596003765
*/
 using System;

 namespace PassByRef
 {

     public class Time
     {
         // private member variables
         private int Year;
         private int Month;
         private int Date;
         private int Hour;
         private int Minute;
         private int Second;

         // Property (read only)
         public int GetHour()
         {
             return Hour;
         }

         // public accessor methods
         public void DisplayCurrentTime()
         {
             System.Console.WriteLine("{0}/{1}/{2} {3}:{4}:{5}",
                 Month, Date, Year, Hour, Minute, Second);
         }

         // takes references to ints
         public void GetTime(ref int h, ref int m, ref int s)
         {
             h = Hour;
             m = Minute;
             s = Second;
         }

         // constructor
         public Time(System.DateTime dt)
         {

             Year = dt.Year;
             Month = dt.Month;
             Date = dt.Day;
             Hour = dt.Hour;
             Minute = dt.Minute;
             Second = dt.Second;
         }


     }

    public class TesterPassByRef
    {
       public void Run()
       {
           System.DateTime currentTime = System.DateTime.Now;
           Time t = new Time(currentTime);
           t.DisplayCurrentTime();

           int theHour = 0;
           int theMinute = 0;
           int theSecond = 0;

           // pass the ints by reference
           t.GetTime(ref theHour, ref theMinute, ref theSecond);

           System.Console.WriteLine("Current time: {0}:{1}:{2}",
               theHour, theMinute, theSecond);

       }

       static void Main()
       {
          TesterPassByRef t = new TesterPassByRef();
          t.Run();
       }
    }
 }

1.	Parameter out and reference
2.	Passing Parameters By Value and By Ref
3.	Objects can be passed to methods
4.	Simple types are passed by value
5.	Objects are passed by reference
6.	Use ref to pass a value type by reference
7.	Swap two values
8.	Use out
9.	Use two out parameters
10.	Swap two references
11.	Demonstrate params
12.	Use regular parameter with a params parameter
13.	Parameter demo
14.	Passing parameters by reference
15.	Passing parameters by value
16.	Illustrates the use of out parameters
17.	Pass value by reference
18.	Ref and Out Parameters: compiling error
19.	C# Ref and Out Parameters
20.	Ref and Out Parameters 2

Pass value by reference with read only value : Parameters Passing « Language Basics « C# / C Sharp

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