using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Text;

 using System.Threading.Tasks;

 namespace ConsoleApplication7

 {

     class Program

     {

         static void Main(string[] args)

         {

             string result;

             Console.WriteLine("请输入用户名");

             string name = Console.ReadLine();

             Console.WriteLine("请输入密码");

             string password = Console.ReadLine();

             if (Test(name, password, out result))

             {

                 Console.WriteLine(result);

             }

             else

             {

                 Console.WriteLine(result);

             }

             Console.ReadKey();

         }

         static bool Test(string name, string password, out string result)

         {

             if (name == "admin" && password == "")

             {

                 result = "登录成功";

                 return true;

             }

             else if (name == "admin")

             {

                 result = "密码错误";

                 return false;

             }

             else

             {

                 result = "用户名错误";

                 return false;

             }

         }

     }

 }