//ushort year;
            //if (ushort.TryParse(textBox1.Text, out year))//将输入字符串转换为数值?求解？？？？？
            //{
            //    MessageBox.Show((year%4==0&&year%100!=0)||year%400==0?"你输入的年份为闰年":"你输入的年份不是闰年");
            //}
            //else
            //{
            //    MessageBox.Show("你输入的数字有误！");
            //}



namespace 开发入门及实践练习
{
    class Program
    {
        //    enum MyEnum //枚举类放在 class Program里与放在命名空间里有和不同？？？
    //    {
    //        sun=0,mon=1,tue=2,wed=3,thi=4,fri=5,sat=6
    //    }
        //class text
        //{
        //    public void show()
        //    {
        //        string name1 = "婷子";
        //        Console.WriteLine("{0}",name1);
        //    }
        //    public void show2()
        //    {
        //        string name2 = "明日科技";
        //        Console.WriteLine("{0}",name2);
        //    }
        //}
        //class text
        //{
        //    public void show()
        //    {
        //        for (int i = 0; i < 5; i++)
        //        {
        //            Console.WriteLine(i.ToString());
        //        }
        //    }
        //}
        static void Main(string[] args)
        {        
        //    text obj = new text();
        //    obj.show();
        //    Console.ReadLine();

            //text obj = new text();
            //obj.show();
            //obj.show2();



        //    text object1 = new text() {name="婷子"};
        //    text object2 = new text() {name="英豪" };
        //    int v1 = 2, v2 = 5;
        //    Console.WriteLine("{0},{1},{2},{3}",v1,v2,object1.name,object2.name);
        //    v2 = v1;
        //    object2.name = object1.name;
        //    object2 = new text() {name="婷子" };
        //    Console.WriteLine("{0},{1},{2},{3}", v1, v2, object1.name, object2.name);
        //    v2 = 10;
        //    object2 = new text() {name="小雪" };
        //    Console.WriteLine("{0},{1},{2},{3}", v1, v2, object1.name, object2.name);
        //    Console.ReadLine();

            //int k = (int)DateTime.Now.DayOfWeek;
            //switch (k)
            //{
            //    case (int)MyEnum.sun:Console.WriteLine("星期日");
            //        break;
            //    case (int)MyEnum.mon: Console.WriteLine("星期一");
            //        break;
            //    case (int)MyEnum.tue: Console.WriteLine("星期二");
            //        break;
            //    case (int)MyEnum.wed: Console.WriteLine("星期三");
            //        break;
            //    case (int)MyEnum.thi: Console.WriteLine("星期四");
            //        break;
            //    case(int)MyEnum.fri:Console.WriteLine("星期五");
            //        break;
            //    case(int)MyEnum.sat:Console.WriteLine("星期六");
            //        break;


            //}


            Console.ReadLine();


        }
    }
}
//class text//为什么class text要放在命名空间外面？？？？为什么这个类不写返回值？？？
//{
//    public string name;
//}

不愧是大神！！！！！！！！！