C# Event handling In mutiple level /classes

Answer 1

If you're not editing the data in the event handler of Class B, then simply have both class A and B subscribe to the event in C. If you're editing the data in B for A, then I'd recommend just calling a standard method in A with the data from B.

UPDATE: Based on your clarifications, I'd say just have 2 events - your socket (C) class fires an event when it has data, your socket manager (B) listens for this event and fires another, separate event when it has this data. Your form (A) listens for this event from B and acts on it. That makes your intent clear enough.

Answer 2

Based on my previous answer, it sounds like you have an inheritance heirarchy:

public class A
public class B : A
public class C : B

in which case you shouldn't use events for this. Rather, use base to call each base class.

class Program
{
    static void Main(string[] args)
    {
        C c = new C();
        c.DoStuff(0);
    }
}

public class A
{
    public virtual void DoStuff(int x)
    {
        Console.WriteLine(x);
    }
}

public class B : A
{
    public override void DoStuff(int y)
    {
        y++;
        base.DoStuff(y);
    }
}

public class C : B
{
    public override void DoStuff(int z)
    {
        z++;
        base.DoStuff(z);
    }
}

This example shows creation of your class C and its subsequent editing of data. This data is then passed on to B, which edits the data again before passing onto A.