Single Inheritance

\\ Namespace
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

        public class Program : abc     \\ Main Class
        {
        public static void Main(string []args)       \\ Main Function
        {
            System.Console.WriteLine("I m main class");
            Program x = new Program();
            x.demo();
            abc k = new abc();                           \\ creating object of inherited class
            k.demo();
        }
        public void demo()                                \\Function in class
        {
            System.Console.WriteLine("function in main class");
        }
        }
        public class abc                                        \\base class or inherited class
        {
            public void demo()
            {
                System.Console.WriteLine("class abc");
            }
        }