谢谢大家

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

namespace ConsoleApplication3
{
class Program
{
static void Main(string[] args)
{
string name = "";
string pwd = "";
//循环体：输入用户名和密码 判断
//循环条件：输入错误
do

        {
            Console.WriteLine("请输入用户名");
            name = Console.ReadLine();
            Console.WriteLine("请输入密码");
            pwd = Console.ReadLine();
            if (name != "admin" || pwd != "888888")
            {
                Console.WriteLine("用户名或密码错误");
            }
        } while (name != "admin" || name != "888888") ;

        Console.ReadKey();

    }
}

}
还是没有照片哈哈哈哈哈哈哈