C# Events Example

First u hav Number Class

//Numbers.cs

using System;

public delegate int intDel();

public class Numbers

{

public event intDel  NegativeNumber;

public event intDel  GreaterThanHundered;

public event intDel  ValueChanged;

int _x =0;

public int X{

    get{

return _x;   

    }

    set{

if (value==0)

return;

_x+=value;

ValueChanged();

      if (_x<0)

NegativeNumber() ;

if(_x>100)

GreaterThanHundered();

     }

 }

}

Next u hav Sample class

//Sample.cs

using System;

public class sample

{

Numbers obj;

intDel d;

public static void Main(string[] args) {

sample s=new sample();

s.obj=new Numbers();

s.obj.GreaterThanHundered+=new intDel(s.maxNumber );

s.obj.NegativeNumber+=new intDel(s.negativeNumber );

s.d=new intDel(s.change );

s.obj.ValueChanged+=s.d;

s.obj.ValueChanged+=new intDel(s.Log);

Console.WriteLine(s.obj.X.ToString());

s.obj.X=Convert.ToInt32(args[0]);

Console.WriteLine("***********");

s.obj.X=(Convert.ToInt32(args[0])*100);

}

private int maxNumber(){

Console.WriteLine("Value > 100");

return 0;

}

private int negativeNumber(){

Console.WriteLine("Value <>

return 0;

}

private int change(){

Console.WriteLine("value Changed : "+ obj.X.ToString());

obj.ValueChanged-=this.d;

return 0;

}

private int Log(){

Console.WriteLine("value Logged : "+ obj.X.ToString());

return 0;

}

}