ASP.NET购物车代码程序

        }
        public void WriteShoppingCart()
        {
            if (Request.Params["mode"] != "view")                             //检查是否是直接查看购物车，如果直接查看，就不再写MYCARTTABLE
            {
                DataTable nowTable = new DataTable("nowCartTable");
                nowTable = (DataTable)Session["myCartTable"];
                int pn = nowTable.Rows.Count;

                int i = 0;
                bool hasone = false;
                int nowProdID;

                while (i < pn && !hasone)
                {
                    nowProdID = Int32.Parse(nowTable.Rows[i][0].ToString());
                    if (nowProdID == Int32.Parse(AddProID))                //判断购物信息表中，是否存有当前放入商品。
      if(nowProdID==Int32.Parse(AddProID))
                    {
                        hasone = true;
                    }
                    else
                    {
                        i++;
                    }

     }
                if (hasone)
                {
                    //如果已有该商品，则 hasone=true，更改该数据行

                     string sesToken = RefreshID;
                     //if (sesToken == "")
                     //{
                         DataRow oldDR;
                         oldDR = nowTable.Rows[i];
                         oldDR["max"] = Int32.Parse(oldDR["max"].ToString()) + 1;

                }
                else
                {
                    //如果没有该商品，在表中新加如一行。
                    DataRow newDR;
                    double unitp;
                    string strSQL = "select *  from Product where ProductID=" + AddProID + " and Productrnd="+this.rnd.Text+"";
                    dd.cmd.CommandText = strSQL;
                    DataSet ds = new DataSet();
                   // myCommand.Fill(ds, "AddP");
                    dd.Adp.SelectCommand = dd.cmd;

      dd.Adp.Fill(ds, "Addp");
                    newDR = nowTable.NewRow();
                    newDR[0] = AddProID;

                    newDR[1] = ds.Tables["Addp"].Rows[0]["Name"].ToString();
                    unitp = Double.Parse(ds.Tables["AddP"].Rows[0]["SellPrice"].ToString());        //会员价

                    newDR[2] = ds.Tables["Addp"].Rows[0]["max"].ToString();
                    newDR[3] = ds.Tables["Addp"].Rows[0]["Unit"].ToString();
                    newDR[4] = ds.Tables["Addp"].Rows[0]["SellPrice"].ToString();        //第一次读库，所以总价格和单价是一样的。
                    //newDR[5]="0";
                    nowTable.Rows.Add(newDR);

                   dd.conn.Close();

                }

                ShoppingCartDlt.DataSource = nowTable.DefaultView;         //将更新后的 DataTable棒定到ShoppingCartDlt
                ShoppingCartDlt.DataBind();

                Session["myCartTable"] = nowTable;
                //重新保存更新过的DataTable
            }
        }
        public void Caculator()
        {
            if (Session["myCartTable"] != null)                         //购物车是否为空

     {

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