protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            //完成下载以后更新下载次数

            if (download())

            {

                int count = 0;

                System.IO.StreamReader srd;

                string file_path = Server.MapPath("~/count.txt");

                srd = System.IO.File.OpenText(file_path);

                while (srd.Peek() != -1)

                {

                    string str = srd.ReadLine();

                    count = int.Parse(str);



                }

                srd.Close();

                object obj = count;

                Application["count"] = obj;





                Application.Lock();

                int State = 0;

                State = (int)Application["count"];

                State += 1;

                obj = State;

                Application["count"] = obj;

                file_path = Server.MapPath("~/count.txt");

                System.IO.StreamWriter srw = new System.IO.StreamWriter(file_path, false);

                srw.WriteLine(State);

                srw.Close();

                Application.UnLock();

            }

        }

    }