C# Online Compiler | .NET Fiddle

using System;

public delegate void MyDelegate(string msg);
public class Program
{
	public static void Main()
	{
		MyDelegate del1 = ClassA.MethodA;
		MyDelegate del2 = ClassB.MethodB;
		
		MyDelegate del = del1 + del2;
		Console.WriteLine("After del1 + del2");
		del("Hello World");
		
		MyDelegate del3 = (string msg) => Console.WriteLine("Called lambda expression: " + msg);
		del += del3;
		Console.WriteLine("After del1 + del2 + del3");
		del("Hello World");
		
		del = del - del2;
		Console.WriteLine("After del - del2");
		del("Hello World");
		
		del -= del1;
		Console.WriteLine("After del1 - del1");
		del("Hello World");
	}
}

public class ClassA
{
	public static void MethodA(string message)
	{
		Console.WriteLine("Called ClassA.MethodA() with parameter: " + message);
	}
}

public class ClassB
{
	public static void MethodB(string message)
	{
		Console.WriteLine("Called ClassB.MethodB() with parameter: " + message);
	}
}

 
using System;
​
public delegate void MyDelegate(string msg);
public class Program
{
    public static void Main()
    {
        MyDelegate del1 = ClassA.MethodA;
        MyDelegate del2 = ClassB.MethodB;
        
        MyDelegate del = del1 + del2;
        Console.WriteLine("After del1 + del2");
        del("Hello World");
        
        MyDelegate del3 = (string msg) => Console.WriteLine("Called lambda expression: " + msg);
        del += del3;
        Console.WriteLine("After del1 + del2 + del3");
        del("Hello World");
        
        del = del - del2;
        Console.WriteLine("After del - del2");
        del("Hello World");
        
        del -= del1;

Hello World
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