购物车购物

if (Session["Pro"] == null)
            {
                DataTable dt = new DataTable();
                dt.Columns.Add("_id", typeof(int));//商品id
                dt.Columns.Add("_title", typeof(string));//商品名
                dt.Columns.Add("_color", typeof(string));//商品颜色
                dt.Columns.Add("_sizename", typeof(String));//商品尺码
                dt.Columns.Add("_catename", typeof(String));//商品类别
                dt.Columns.Add("_imageurl", typeof(String));//商品类别

DataRow dr = dt.NewRow();
                dr["_id"] = _id.Text;
                dr["_title"] = title_l.Text;
                dr["_color"] = d_color.Text;
                dr["_sizename"] = _SizeOne.Text;
                dr["_catename"] = _Cate.Text;
                dr["_imageurl"] = Image_1.ImageUrl;
                dt.Rows.Add(dr);

Session["Pro"] = dt;
                Response.Redirect("shoplist.aspx");
                Response.End();
            }
            else
            {
                //datatable是在第一条数据上累加的
                DataTable dt = Session["Pro"] as DataTable;
                DataRow dr = dt.NewRow();
                dr["_id"] = _id.Text;
                dr["_title"] = title_l.Text;
                dr["_color"] = d_color.Text;
                dr["_sizename"] = _SizeOne.Text;
                dr["_catename"] = _Cate.Text;
                dr["_imageurl"] = Image_1.ImageUrl;
                dt.Rows.Add(dr);

Session["Pro"] = dt;
                Response.Redirect("shoplist.aspx");
                Response.End();
            }