public delegate void EventHandler(object sender, EventArgs e);

[Serializable]  
public delegate void EventHandler<TEventArgs>(object sender, TEventArgs e) where TEventArgs: EventArgs;

class IntEventArgs : System.EventArgs  
{  
  public int IntValue { get; set; }  
  public IntEventArgs() { }  
  public IntEventArgs(int value)  
  { this.IntValue = value; }  
}  
 
class StringEventArgs : System.EventArgs  
{  
  public string StringValue { get; set; }  
  public StringEventArgs() { }  
  public StringEventArgs(string value)  
  { this.StringValue = value; }  
}  
 
class Program  
{  
  static void PrintInt(object sender, IntEventArgs e)  
  {  
    Console.WriteLine(e.IntValue);  
  }  
 
  static void PrintString(object sender, StringEventArgs e)  
  {  
    Console.WriteLine(e.StringValue);  
  }  
 
  static void Main(string[] args)  
  {  
    EventHandler<IntEventArgs> ihandler = new EventHandler<IntEventArgs>(PrintInt);  
    EventHandler<StringEventArgs> shandler = new EventHandler<StringEventArgs>(PrintString);  
 
    ihandler(null, new IntEventArgs(100));  
    shandler(null, new StringEventArgs("Hello World"));  
  }  
}