using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;
using System.Data.SqlClient;

public partial class ShoppingCart : System.Web.UI.Page
{
    public int goods_id = 0;
    public int ProdCount = 0;

    public int sum = 0;
    DataSet ds = new DataSet();
    
    
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            HttpCookie cookie = Request.Cookies["UserInfo"];
            if (null == cookie)
            {
                Response.Write("<script>location.href='login.aspx'</script>");
                Response.End();
            }

            if (Request.QueryString["goods_id"] != null || Request.QueryString["goods_id"] != "")
            {
                goods_id = Convert.ToInt32(Request.QueryString["goods_id"]);
            }
            if (Request.QueryString["ProdCount"] != null || Request.QueryString["ProdCount"] != "")
            {
                ProdCount = Convert.ToInt32(Request.QueryString["ProdCount"]);
            }

            if (Session["myCartTable"] == null)
            {
                DataTable newDT = new DataTable("CartTable");
                ds.Tables.Add(newDT);
                DataColumn newDC;
                newDC = new DataColumn("ProdID", System.Type.GetType("System.Int32"));
                ds.Tables["CartTable"].Columns.Add(newDC);
                newDC = new DataColumn("ProdCount", System.Type.GetType("System.Int32"));
                newDC.DefaultValue = 2;
                ds.Tables["CartTable"].Columns.Add(newDC);
                newDC = new DataColumn("ProName", System.Type.GetType("System.String"));
                ds.Tables["CartTable"].Columns.Add(newDC);
                newDC = new DataColumn("SalePrice", System.Type.GetType("System.Double"));
                ds.Tables["CartTable"].Columns.Add(newDC);
                newDC = new DataColumn("MarketPrice", System.Type.GetType("System.Double"));
                ds.Tables["CartTable"].Columns.Add(newDC);
                Session["myCartTable"] = ds;
                StringBuilder strSqlString = new StringBuilder();
                strSqlString.Append("select ");
                strSqlString.Append("pro_name, ");
                strSqlString.Append("pro_sale_price, ");
                strSqlString.Append("pro_market_price ");
                strSqlString.Append("from ");
                strSqlString.Append("tb_products ");
                strSqlString.Append("where ");
                strSqlString.Append("pro_id = " + goods_id);
                DataSet dss = SqlHelper.GetDataSet(SqlHelper.ConnectionString, CommandType.Text, strSqlString.ToString(), null);
                if (goods_id > 0)
                {
                    if (dss.Tables[0].Rows.Count > 0)
                    {
                        DataRow dr = newDT.NewRow();
                        dr["ProdID"] = goods_id;
                        dr["ProdCount"] = ProdCount;
                        dr["ProName"] = dss.Tables[0].Rows[0]["pro_name"];
                        dr["SalePrice"] = dss.Tables[0].Rows[0]["pro_sale_price"];
                        dr["MarketPrice"] = Convert.ToDouble(dss.Table