C# Overriding example using virtual and override keywords, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine("Hello, world!");
            
            A a = new A();
            a.Method();
            
            B b = new B();
            b.Method();
            
            A ab = new B();
            ab.Method();
            
            B bc = new C();
            bc.Method();
        }
        
        
        class A{
        public virtual void Method()
        {
            Console.WriteLine("A");
        }
        }
        
        class B:A{
        public override void Method()
        {
            Console.WriteLine("B");
        }
        }
        
        class C:B{
        public void Method()
        {
            Console.WriteLine("C");
        }
        }
        
        
        
        
        
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,12 sec, absolute running time: 0,08 sec, cpu time: 0,06 sec, average memory usage: 12 Mb, average nr of threads: 3