asp.net 实现购物车详细代码

＜%@ Page language="c#" Codebehind="shoppingcart.aspx.cs" AutoEventWireup="false" Inherits="myshop.shoppingcart" %＞＜!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" ＞＜HTML＞ ＜HEAD＞
＜title＞shoppingcart
＜/title＞
＜meta http-equiv="Content-Type" content="text/html;
charset=gb2312"＞ ＜LINK href="mycss.css" type="text/css" rel="stylesheet"＞
＜meta name="vs_defaultClientScript" content="JavaScript"＞
＜meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5"＞ ＜/HEAD＞
＜body＞ ＜center＞
＜form id="Form1" runat="server"＞ ＜table width="500" border="0" cellspacing="0" cellpadding="0"＞ ＜tr＞ ＜td＞
＜asp:DataGrid id="ShoppingCartDlt" runat="server" Width="500" BackColor="white" BorderColor="black" ShowFooter="false" CellPadding="3" CellSpacing="0" Font-Name="Verdana" Font-Size="8pt" HeaderStyle-BackColor="#cecfd6" AutoGenerateColumns="false" MaintainState="true"＞ ＜Columns＞
＜asp:TemplateColumn HeaderText="删除"＞
＜ItemTemplate＞ ＜center＞
＜asp:CheckBox id="chkProductID" runat="server" /＞ ＜/center＞
＜/ItemTemplate＞ ＜/asp:TemplateColumn＞
＜asp:BoundColumn DataField="ProdID" HeaderText="ID" /＞
＜asp:BoundColumn DataField="ProName" HeaderText="商品名称" /＞
＜asp:BoundColumn DataField="UnitPrice" HeaderText="单价" /＞
＜asp:TemplateColumn HeaderText="数量"＞
＜ItemTemplate＞
＜asp:TextBox id="CountTb" runat="server" Text='＜%#DataBinder.Eval( Container.DataItem,"ProdCount" )%＞'＞ ＜/asp:TextBox＞
＜/ItemTemplate＞ ＜/asp:TemplateColumn＞
＜asp:BoundColumn DataField="TotalPrice" HeaderText="小计( 元 )" /＞ ＜/Columns＞ ＜/asp:DataGrid＞＜/td＞ ＜/tr＞ ＜/table＞ ＜br＞ ＜table width="500" border="0" cellspacing="0" cellpadding="0"＞ ＜tr＞ ＜td＞
＜asp:Button id="update" runat="server" Text="更新我的购物车" CssClass="button2" /＞＜/td＞ ＜td＞
＜asp:Button id="CheckOut" runat="server" Text="结算" CssClass="button5" /＞

＜input type="button" name="close2" value="继续购物" onClick="window.close( );
return false;
" class="button2"＞＜/td＞ ＜td align="right"＞＜br＞
＜asp:Label id="label" runat="server" Width="100px" Visible="True" ForeColor="#FF8080" Height="18px"＞＜/asp:Label＞＜/td＞ ＜/tr＞ ＜/table＞
＜/form＞ ＜/center＞
＜/body＞＜/HTML＞=======================================================================================以上为HTML页面部分
==========================================================================================
using System;
using System.Collections;
using System.ComponentModel;
using System.Web.SessionState;

using System.Web;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.OleDb;
using System.Configuration;
namespace myshop
{
/// ＜summary＞ /// shoppingcart 的摘要说明. /// ＜/summary＞ public class shoppingcart : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataGrid ShoppingCartDlt;
protected System.Web.UI.WebControls.Button update;
protected System.Web.UI.WebControls.Button CheckOut;
protected System.Web.UI.HtmlControls.HtmlForm Form1;
protected System.Web.UI.WebControls.Label label;
protected System.Web.UI.WebControls.CheckBox chkProductID;
protected System.Web.UI.WebControls.TextBox txtCount;
protected System.Web.UI.WebControls.TextBox CountTb;
string AddProID;
private void Page_Load( object sender, System.EventArgs e )
{
try
{
if ( Session["logon"]!="yes"　　Session["username"]==null )
{
Response.Redirect( "error.htm" ) ;
}
}
catch
{
Response.Redirect( "error.htm" ) ;
}
/////////////查看用户是否已经登陆.
if( !IsPostBack )
{
if( Request.Params["mode"]=="view" ) //检测是否为直接查看购物车.
{
ViewShoppingCart( );
Caculator( );
}
if( Request.Params["productID"]!=null　　Request.Params["productID"]!="" )
{
AddProID=Request["productID"];
UpdateShoppingCart( );
Caculator( );
}
}
// 在此处放置用户代码以初始化页面
}
public void CreateCartTable( ) //创建购物车
{
DataSet ds = new DataSet( );
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=1;
ds.Tables["CartTable"].Columns.Add( newDC );
newDC=new DataColumn( "ProName",System.Type.GetType( "System.String" ) );
ds.Tables["CartTable"].Columns.Add( newDC );
newDC=new DataColumn( "UnitPrice",System.Type.GetType( "System.Double" ) );
ds.Tables["CartTable"].Columns.Add( newDC );
newDC=new DataColumn( "TotalPrice",System.Type.GetType( "System.Double" ) );
ds.Tables["CartTable"].Columns.Add( newDC );
newDC=new DataColumn( "IsDeleted",System.Type.GetType( "System.Int32" ) );

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