delegate(대리자)

using System;
// Declare delegate -- defines required signature:
delegate void SampleDelegate(string message);

class MainClass
{
    // Regular method that matches signature:
    static void SampleDelegateMethod(string message)
    {
        Console.WriteLine(message);
    }

    static void Main()
    {
        // Instantiate delegate with named method:
        SampleDelegate d1 = SampleDelegateMethod;
        // Instantiate delegate with anonymous method:
        SampleDelegate d2 = delegate(string message)
        { 
            Console.WriteLine(message); 
        };

        // Invoke delegate d1:
        d1("Hello");
        // Invoke delegate d2:
        d2(" World");
    }
}

[출처] MSDN