Preview:
using System;
delegate void CustomDel(string s);
class TestClass
{
    static void Hello(string s){
        Console.WriteLine($"  Hello, {s}!");
    }
    static void Goodbye(string s){
        Console.WriteLine($"  Goodbye, {s}!");
    }
    static void Main()
    {
        CustomDel hiDel, byeDel, multiDel, multiMinusHiDel;
        hiDel = Hello;
        byeDel = Goodbye;
        multiDel = hiDel + byeDel;
        multiMinusHiDel = multiDel - hiDel;
        Console.WriteLine("Invoking delegate hiDel:");
        hiDel("A");
        Console.WriteLine("Invoking delegate byeDel:");
        byeDel("B");
        Console.WriteLine("Invoking delegate multiDel:");
        multiDel("C");
        Console.WriteLine("Invoking delegate multiMinusHiDel:");
        multiMinusHiDel("D");
    }
}
/* Output:
Invoking delegate hiDel:
  Hello, A!
Invoking delegate byeDel:
  Goodbye, B!
Invoking delegate multiDel:
  Hello, C!
  Goodbye, C!
Invoking delegate multiMinusHiDel:
  Goodbye, D!
*/
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