如题
很急。。。尽快。。。太感谢了~~~~~~

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

namespace forth
{
    class Secret
    {
        public static void PassWord()
        {
        back:
            Console.WriteLine("***欢迎进入用户登陆系统***\n");

            Console.WriteLine("请输入用户名：");
            string a = Console.ReadLine();
            Console.WriteLine("请输入用户密码：");
            string b = Console.ReadLine();


            if (a == "abc" && b == "123")
            {
                Console.Clear();
                Console.WriteLine("\t输入正确！~~");
                Console.WriteLine ();
            }
            else
            {
                Console.WriteLine();
                Console.WriteLine("您输入的用户名或密码错误！~~");
                Console.WriteLine("      请重新输入！~~");
                Console.WriteLine();
                goto back;
            }


        }
    }
}

汇编版自然用汇编 看偶的一个例子就是了

https://bbs.bccn.net/thread-223568-1-1.html