Explain the concept of delegates in C# and their main purpose.

Delegates in C# are types that represent references to methods with a specific signature and return value. They allow storing and invoking methods as objects.

Main purposes of delegates:

• Enable callbacks
• Provide flexibility in method invocation, for example, for events and asynchronous operations handling
• Used to implement event-driven models

Example of a delegate:

// Delegate declaration
public delegate void Notify(string message);

class Program
{
    static void Main()
    {
        Notify notifyHandler = ShowMessage;
        notifyHandler("Hello, delegates!");
    }

    static void ShowMessage(string msg)
    {
        Console.WriteLine(msg);
    }
}

Here, the Notify delegate can reference any method that takes a string and returns void.