Creating an event. : Delegate event : Delegate C# Examples

    
using  System;
public  delegate  void  AgeChangeHandler(int  age,  object  obj,
                ref  bool  dontdoit);

class  Employee  {
        public  event  AgeChangeHandler  AgeChange;
        int  fAge;
        public  int  Age  {
                set  {
                        Boolean  dontdoit  =  false;
                        AgeChange(value,  this,  ref  dontdoit);
                        if  (!dontdoit)
                                fAge  =  value;
                }
                get  {
                        return  fAge;
                }
        }
        public  Employee()  {
                fAge  =  0;
        }
}
class  MainClass  {
        private  static  void  MyAgeChangeHandler(int  age,  object  obj,
                    ref  bool  dontdoit)  {
                Console.WriteLine(
                      "MyAgeChangeHandler  called  with  age  {0}  obj.age  =  {1}",
                            age,  ((Employee)obj).Age);
                if  (age  <  0  ||  age  >  99)
                        dontdoit  =  true;
        }

        public  static  void  Main()  {
                Employee  p  =  new  Employee();
                //  Set  up  our  handler
                p.AgeChange  +=  new  AgeChangeHandler(MyAgeChangeHandler);
                p.Age  =  21;
                p.Age  =  33;

        }
}