invoking base class event from the method of derived class method

[furqi]

hi every body
i write a code in c sharp in which i have made a base class and make an event there.Then i make a derived class and made an other event in that class.
Now what i wanna do is that i wanna invoke in derived class method the base class event but i am facing an error there i am unable find the solution.canaby body tell me the solution.follow ing is the code.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace derivedevents
{
    delegate void eventhandler();
    class bclass
    {
        public  event eventhandler handler;
        public void furqan()
        {
            Console.WriteLine("furqan");
        }
        public void furqan1()
        {
            Console.WriteLine("ahmed");
        }
        public void fire()
        {
            handler();
        }

    }
}

//now the base class
namespace derivedevents
{
    delegate void eventhandler1();
    class dclass:bclass 
    {
        public event eventhandler1 handler1;
        public void ahmed()
        {
            Console.WriteLine("ahmed");
        }
        public void ahmed1()
        {
            Console.WriteLine("ahmed ahmed");
        }
        public void fire1()
        {
            handler1();
            handler();\\[B] i am actually facing the problem here facing error[/B]       
        }

    

    
    }
}

[tlhintoq]

TIP: When you are writing your question, there is a button on the tool bar that wraps the [code] tags around your copy/pasted code. It helps a bunch. Its the button with a '#' on it. More on tags. They're cool. Check'em out.

[RobertPerona]

To fix your immediate problem you could change your fire1 method in derived class to the following.

        public void fire1() 
        { 
            handler1(); 
            base.fire();         
        }

I would recommend checking out the following link for more on the suggested form of events in c#
MSDN: Raising Base Class Events
MSDN: Event Design

[furqi]

again error

i have also used base keyword but it is also giving me an error
any other suggestion please

[RobertPerona]

Please post the error you are getting. Also any additional code, for example the code you are using to instantiate and call the class if you are getting a runtime exception.

In addition for safety in case of execution of unattached events any code invoking the event should follow the following pattern, outlined in previous links I posted.

        
        public void fire1()  
        {  
            if(handler1 != null)
            {
                handler1();  
            }
            base.fire();          
        }

Notes

1. This would also apply to your fire method in the base class, test for handler to be null before invoking.
2. Normally the event execution method would be named On<Event Name> in you code being onHandler.

[tlhintoq]

Another example

http://bytes.com/topic/c-sharp/insights/877737-c-events-practical-example#post3528708