password protector

using System;


namespace passwordprogram
{
    class Program
    {
        static void Main(string[] args)
        {
            string usernameInput;
            string passwordInput;
            string username = "User";
            string password = "Pass";

            Console.WriteLine("Please enter your username and password below!");

            Console.Write("Username: ");
            usernameInput = Console.ReadLine();

            Console.Write("Password: ");
            passwordInput = Console.ReadLine();

            if (username == usernameInput && password == passwordInput)
            {
                Console.WriteLine("Welcome back {0}!", username);
                System.Diagnostics.Process.Start(@"C:\Windows\System32\Notepad.exe");
            }

            else if (username == usernameInput | password == passwordInput)
                Console.WriteLine("Incorrect username/password combo.");
            else
                Console.WriteLine("Incorrect! Try again");
        }
    }
}