1．看以下程序，写出该程序运行结果：
?    using System;
?    class A
?    {
?        public A() { Console.Write("Constructing base..."); }
?        ~A() { Console.Write("Destructing base..."); }
?    }
?    class B:A
?    {
?        public B() { Console.Write("Constructing derived..."); }
?        ~B() { Console.Write("Destructing derived..."); }
?    }
?    class Program
?    {
?        static void Main(string[] args)
?        {
?            B b = new B();
?        }
?    }
?    Constructing base...
?    Constructing derived...
?    Destructing derived...
?    Destructing base...
?    


2．窗体上有一个命令按钮button1和一个标签控件label1,并有以下程序：
?    public enum WeekDay
?            {
?                Sunday,Monday,Tuesday,Wednesday,
?               Thursday=-1,Friday,Saturday
?            }
public button1_Click(object sender,EventArgs e)
{
        WeekDay day=WeekDay.Friday+1;
         label1.Text=day.ToString();
 }
则程序运行后，单击命令按钮，标签上显示的内容为？              。