pure coding for 1 week ...

Assume you have a base class and another class derived from it. You have events defined in base class so you wish to use them in the derived class.

    class a
    {
        publicdelegatevoid Amanindelegate();
        publicevent Amanindelegate Amanin;
    }

    class b:a
    {
        publicvoid hey0()
        {
            Amanin();
        }
    }
    class Program
    {
        staticvoid Main(string[] args)
        {
            b b1=new b();
            b1.Amanin+=new a.Amanindelegate(b1_Amanin);
            b1.hey0();
        }
        staticvoid b1_Amanin()
        {
            Console.WriteLine("aboovv");
        }
    }

Here you have the mentioned error in hey0 method line Amanin();
The best practice is as follows.

          
            class a
{ publicdelegatevoid Amanindelegate(); publicvirtualevent Amanindelegate
Amanin; } class b:a
{ publicoverrideevent a.Amanindelegate
Amanin; publicvoid hey0()
{ Amanin(); } } class Program
{ staticvoid Main(string[]
args) { b b1=new b();
b1.Amanin+=new a.Amanindelegate(b1_Amanin);
b1.hey0(); } staticvoid b1_Amanin()
{ Console.WriteLine("aboovv");
} } 
        

 

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