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    public class serviceShopping : System.Web.Services.WebService

{

    [WebMethod]

    //获取商品

    public DataSet getGoods()

    {

        SqlConnection con = new SqlConnection("server=.;database=shop;uid=sa;pwd=123456;");

        con.Open();

        SqlDataAdapter adr = new SqlDataAdapter();

        adr.SelectCommand = new SqlCommand("select * from goods", con);

        DataSet ds = new DataSet();

        adr.Fill(ds, "goods");

        con.Close();

        return ds;

    }

    [WebMethod]

    //购物

    public string shopping(int sum)

    {

        try

        {

            //买家买东西

            this.buy(sum);

            //卖家卖东西

            this.sell(sum);

            return "交易成功,消费："+sum;

        }

        catch

        {

            return "交易失败";

        }

    }

    //买家买东西

    private void buy(int sum)

    {

        SqlConnection con = new SqlConnection("server=.;database=shop;uid=sa;pwd=123456;");

        con.Open();

        SqlCommand cmd = new SqlCommand("update buy set money=money-" + sum.ToString() + " where  buyer=‘A‘", con);

        cmd.ExecuteNonQuery();

        con.Close();

    }

    //卖家卖东西

    private void sell(int sum)

    {

        SqlConnection con = new SqlConnection("server=.;database=shop;uid=sa;pwd=123456;");

        con.Open();

        SqlCommand cmd = new SqlCommand("update sell set money=money+" + sum.ToString() + " where  seller=‘B‘", con);

        cmd.ExecuteNonQuery();

        con.Close();

    }

}

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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

    <title></title>

    <form id="form1" runat="server">

    <div>

        </asp:checkboxlist>

    </asp:button></div>

    </form>

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public partial class UseServerShopping : System.Web.UI.Page

{

    //绑定商品列表

    protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            myserviceShopping.serviceShoppingSoapClient getGoodslist = new myserviceShopping.serviceShoppingSoapClient();

            this.CheckBoxList1.DataSource = getGoodslist.getGoods();   //绑定商品列表

            this.CheckBoxList1.DataTextField = "goodsname";

            this.CheckBoxList1.DataValueField = "cost";

            this.CheckBoxList1.DataBind();

        }

    }

    //购买商品

    protected void Button1_Click(object sender, EventArgs e)

    {

        //商品价格

        int totalCost=0;

        //计算商品总共价格

          for (int i = 0; i < CheckBoxList1.Items.Count; i++)  //循环checjboxlist1的个数

        {

            if (CheckBoxList1.Items[i].Selected == true)  //checjboxlist1被选中

            {

                totalCost =totalCost+ Convert.ToInt32(CheckBoxList1.Items[i].Value);  //计算商品总价格

            }

         }

        myserviceShopping.serviceShoppingSoapClient buyGoods = new myserviceShopping.serviceShoppingSoapClient();

        buyGoods.shopping(totalCost);   //调用服务中使买家付款给卖家

        Response.Write(buyGoods.shopping(totalCost));

    }

}