The book Illustrated C# 7, Fifth Edition by Daniel Solis and Cal Schrotenboer published by Apress there is an example of a delegate on page 360.

• Class Test defines two print functions.
• Method Main creates an instance of the delegate and then adds three more methods with +=.
• The program then invokes the delegate, which calls its methods. Before invoking the delegate, however, it checks to make sure
  it’s not null.
• You can remove any method from the invocation list with -=.
• You can use either static methods or instance methods to instantiate a delegate.

Below is the example code, modified by including a removal of one of the methods.

using System;

namespace IllustratedPage360
{
    // Define a delegate type with no return value and no parameters.
    delegate void PrintFunction();

    class Test
    {
        public void Print1()
           { Console.WriteLine("Print1 -- instance"); }
        public static void Print2()
           { Console.WriteLine("Print2 -- static"); }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Test t = new Test(); // Create a test class instance.
            PrintFunction pf; // Create a null delegate.
            pf = t.Print1; // Instantiate and initialize the delegate.
                           // Add three more methods to the delegate.
            pf += Test.Print2;
            pf += t.Print1;
            pf += Test.Print2;
            pf -= t.Print1;  // remove method even though it was not last one
            // The delegate now contains four methods.
            if (null != pf) // Make sure the delegate isn't null.
                pf(); // Invoke the delegate.
            else
                Console.WriteLine("Delegate is empty");
        }
    }
    // OUTPUT:
    // Print1 -- instance
    // Print2 -- static
    // Print1 -- instance // This one was removed above and will not display!
    // Print2 -- static
}