Delegates and Callbacks

Question

Does the term callback in the context of delegates mean ,\"a delegate delegating it works to another delegate inorder to finish some task\" ?

Example :(

Answer 1

A callback is what the delegate executes when it is invoked. For example, when using the Asynchronous pattern using delegates, you would do something like this:

public static void Main(string[] args)
{
    Socket s = new Socket(...);

    byte[] buffer = new byte[10];
    s.BeginReceive(buffer, 0, 10, SocketFlags.None, new AsyncCallback(OnMessageReceived), buffer);

    Console.ReadKey();
}

public static void OnMessageReceived(IAsyncResult result)
{
    // ...
}

OnMessageReceived is the callback, the code that is executed by invoking the delegate. See this Wikipedia article for some more information, or Google some more examples.