Use ref to pass a value type by reference : ref « Language Basics « C# / CSharp Tutorial

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C# / CSharp Tutorial » Language Basics » ref 
1.11.1.Use ref to pass a value type by reference

The ref parameter modifier causes C# to create a call-by-reference, rather than a call-by-value.

using System; 
 
class RefTest 
  /* This method changes its argument. 
     Notice the use of ref. */ 
  public void sqr(ref int i) { 
    i = i * i; 
  

 
class MainClass 
  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)
  
}
a before call: 10
a after call: 100
1.11.ref
1.11.1.Use ref to pass a value type by reference
1.11.2.Swap two values
1.11.3.Swap two references.
1.11.4.Use out for reference type
1.11.5.Use ref for int value
1.11.6.Use ref for reference type
1.11.7.Change string using ref keyword
1.11.8.Passing Parameters by Value
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