我把错得离谱的写出来，大家就明白我什么意思了。

           string a;
             Console.Write("请输入姓名：");
             a=Console.ReadLine();
           
             if (a == "张三")
             {
                 Console.WriteLine("输入对啦");
             }
             else
             {
                 a++;
             }

while(true){
string a="";
             Console.Write("请输入姓名：");
             a=Console.ReadLine();
           
             if (a == "张三")
             {
                 Console.WriteLine("输入对啦");
                    break;
             }
                //continue;
}

string name;
            Console.WriteLine("请输入正确的名字：");
            name = Console.ReadLine();
            while (name != "正确的名字")
            {
                Console.WriteLine("名字错误，请重新输入！");
                name = Console.ReadLine();
            }
            Console.WriteLine("恭喜您，输入正确！");

string name;
            Console.WriteLine("请输入正确的名字：");
            name = Console.ReadLine();
            while (name != "正确的名字")
            {
                Console.WriteLine("名字错误，请重新输入！");
                name = Console.ReadLine();
            }
            Console.WriteLine("恭喜您，输入正确！");