通用檔案配置session 做身份識別和購物車

 void Session_Start(object sender, EventArgs e)
    {
        //在新會話啟動時啟動並執行代碼
        Session["UserID"] = "";//在客戶登陸之前，預設為“遊客”，UserID為空白
        Session["UserName"] = "遊客";
        Session["UserSex"] = "";
        Session["UserRight"] = "0"; //0表示是一般客戶，1為管理員
        //定義購物車表的結構
        DataTable dtShopCart = new DataTable();//建立購物車表
       DataColumn keyCol = new DataColumn("BookID", typeof(Int32));//建立資料列
        dtShopCart.Columns.Add(keyCol);
        dtShopCart.Columns.Add(new DataColumn("BookName", typeof(string)));
        dtShopCart.Columns.Add(new DataColumn("BookAuthor", typeof(string)));
        dtShopCart.Columns.Add(new DataColumn("PubName",typeof(string)));
        dtShopCart.Columns.Add(new DataColumn("OrigPrice",typeof(string)));
        dtShopCart.Columns.Add(new DataColumn("SellPrice", typeof(decimal)));
        dtShopCart.Columns.Add(new DataColumn("BuyNum",typeof(decimal)));
        DataColumn[] primkeys = new DataColumn[1]; //建立資料列來儲存主鍵
        primkeys[0] = keyCol;
        dtShopCart.PrimaryKey = primkeys;
        Session["dtShopCart"] = dtShopCart; //在Session中變數中儲存購物車

    }