namespace ConsoleApplication1
{
    using System;

    internal class Program
    {
        private static bool CheckUser(string username)
        {
            //return (username == "admin");
            return true;
        }

        private static void Main(string[] args)
        {
            Console.Write("UserName:");
            if (CheckUser(Console.ReadLine()))
            {
                Console.WriteLine("Valid");
            }
            else
            {
                Console.WriteLine("Invalid");
            }
            Console.ReadLine();
        }
    }
}