Session原理

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

namespace WebApplication1
{
    public partial class 自增 : System.Web.UI.Page
    {
        public int i = 0;//每次调用都实例化一个自增对象（自增 p = new 自增（）;p.i=0;）
        private static int j = 0;//static 是一个全局变量与实例化无关。
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)//这里不会自增
        {
            i++;
            Label1.Text = i.ToString();

        }

        protected void Button2_Click(object sender, EventArgs e)//这里会自增
        {
            j++;
            Label2.Text = j.ToString();
        }
    }
}