资源：同级目录下的存放当前计数的count.txt文件
            子目录pic下的0到9的数字图片0.gif ~ 9.gif
            --------------------------------
            asax文件：
            <%@ Control Language="c#" AutoEventWireup="false"
            Codebehind="counter.ascx.cs" Inherits="JiAnWeb.counter"
            TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
           
           
                        width="750" align="center" border="0"
            runat="server">
           
           
           
           
           
           
           

height="1" alt=""             src="http://www.newasp.net/Article/net/develop/2005/pic/rightblueback.gif"             width="700">

           
            －－－－－－－－－－－－－－－－－－－
            .cs文件：
            namespace JiAnWeb
            {
            using System;
            using System.Data;
            using System.Drawing;
            using System.Web;
            using System.Web.UI.WebControls;
            using System.Web.UI.HtmlControls;
            ///

            /// counter 的摘要说明。
            ///

            public class counter : System.Web.UI.UserControl
            {
            protected System.Web.UI.HtmlControls.HtmlTable table_counter;
            private void Page_Load(object sender, System.EventArgs e)
            {
            // 在此处放置用户代码以初始化页面
            string
            filePath=System.Web.HttpContext.Current.Server.MapPath("hits.txt");
            System.IO.StreamReader srReadLine = new System.IO.StreamReader(
            System.IO.File.OpenRead(filePath),
            System.Text.Encoding.ASCII);//Encoding.Default是读中文
            srReadLine.BaseStream.Seek(0, System.IO.SeekOrigin.Begin);//
            string countStr="";
            if (srReadLine.Peek() > -1)
            {
            countStr+=srReadLine.ReadLine();
            }
            int count=int.Parse(countStr)+1;
            countStr=count.ToString();
            srReadLine.Close();
            table_counter.Rows[1].Cells[0].InnerHtml="";             for (int i=0;i            {
            table_counter.Rows[1].Cells[0].InnerHtml=table_counter.Rows[1].Cells[0].InnerHtml+"            src=/"pic//"+countStr.Substring(i,1)+".gif/">";
            }
            table_counter.Rows[1].Cells[0].InnerHtml+="";
            // Write the string to a file.
            System.IO.StreamWriter file = new System.IO.StreamWriter(filePath);
            file.WriteLine(countStr,false);
            file.Close();
            srReadLine.Close();
            }
            #region Web 窗体设计器生成的代码
            override protected void OnInit(EventArgs e)
            {
            //
            // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
            //
            InitializeComponent();
            base.OnInit(e);
            }
            ///

            /// 设计器支持所需的方法 - 不要使用代码编辑器
            /// 修改此方法的内容。
            ///

            private void InitializeComponent()
            {
            this.Load += new System.EventHandler(this.Page_Load);
            }
            #endregion
            }
            }