Use a static field to count instances

/*
C#: The Complete Reference 
by Herbert Schildt 

Publisher: Osborne/McGraw-Hill (March 8, 2002)
ISBN: 0072134852
*/


// Use a static field to count instances. 
 
using System; 
 
class CountInst {  
  static int count = 0; 
  
  // increment count when object is created 
  public CountInst() {  
    count++; 
  }  
 
  // decrement count when object is destroyed 
  ~CountInst() { 
    count--; 
  } 
  
  public static int getcount() { 
    return count; 
  } 
}  
  
public class CountDemo {  
  public static void Main() { 
    CountInst ob; 
 
 
    for(int i=0; i < 10; i++) { 
      ob = new CountInst(); 
      Console.WriteLine("Current count: " +  
                        CountInst.getcount()); 
    } 
 
  }  
}

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4.	Can call a non-static method through an object reference from within a static method
5.	Use a static class factory
6.	Use a static constructor
7.	Illustrates the use of static members
8.	Demonstrates access to static and non-static members
9.	Demonstrates how a static field is shared by multiple instances of a class
10.	Demonstrates use of static constructor
11.	Use static method to initialize field

Use a static field to count instances : Static « Class Interface « C# / C Sharp

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