Use ref to pass a value type by reference

/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/
// Use ref to pass a value type by reference. 
 
using System; 
 
class RefTest { 
  /* This method changes its arguments. 
     Notice the use of ref. */ 
  public void sqr(ref int i) { 
    i = i * i; 
  } 
} 
 
public class RefDemo { 
  public static void Main() { 
    RefTest ob = new RefTest(); 
 
    int a = 10; 
 
    Console.WriteLine("a before call: " + a); 
 
    ob.sqr(ref a); // notice the use of ref 
 
    Console.WriteLine("a after call: " + a); 
  } 
}

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.	Swap two values
7.	Use out
8.	Use two out parameters
9.	Swap two references
10.	Demonstrate params
11.	Use regular parameter with a params parameter
12.	Parameter demo
13.	Passing parameters by reference
14.	Passing parameters by value
15.	Illustrates the use of out parameters
16.	Pass value by reference
17.	Pass value by reference with read only value
18.	Ref and Out Parameters: compiling error
19.	C# Ref and Out Parameters
20.	Ref and Out Parameters 2

Use ref to pass a value type by reference : Parameters Passing « Language Basics « C# / C Sharp

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