public class student//创建一个学生类    {   //数据成员列表        public string name;                private uint age;        protected char sex;        internal string telephone;        public string grade;        //方法成员列表        public void say()        {            Console.WriteLine("Hello， 淄博汉企");        }        public double Sum(double x, double y)        {            return x + y;        }    }

static void Main(string[] args)        {
    //类的实例化           student stu=new student();           stu.name = "提莫";           stu.grade = "淄博汉企";           stu.telephone = "1234567";            //其他类型的成员此处不可用           Console.WriteLine(stu.name+stu.grade+stu.telephone);            //方法调用           stu.say();           Console.Write(stu.Sum(2, 3));           Console.ReadLine();        }