asp.net更新指定记录的方法

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>
 <form id="form1" runat="server">
        &nbsp;
        <div style="text-align: center">
            <table style="width: 302px; height: 246px;">
                <tr>
                    <td colspan="2" style="width: 496px">
                        <asp:Label ID="Label2" runat="server" Text="更新指定数据" Font-Bold="True" ForeColor="Blue" Width="132px"></asp:Label></td>
                </tr>
                <tr>
                    <td colspan="2" style="width: 496px">
        <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" CellPadding="4" Font-Size="Smaller" ForeColor="#333333" GridLines="None">
            <Columns>
                <asp:BoundField DataField="商品编号" HeaderText="商品编号" />
                <asp:BoundField DataField="商品名称" HeaderText="商品名称" />
                <asp:BoundField DataField="商品数量" HeaderText="商品数量" />
                <asp:BoundField DataField="商品单价" HeaderText="商品单价" />
                <asp:HyperLinkField DataNavigateUrlFields="商品编号" DataNavigateUrlFormatString="Default.aspx?商品编号={0}"
                    HeaderText="更新" Text="更新" />
            </Columns>
            <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
            <EditRowStyle BackColor="#999999" />
            <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
            <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
            <HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
            <AlternatingRowStyle BackColor="White" ForeColor="#284775" />
        </asp:GridView>
                    </td>
                </tr>
                <tr>
                    <td colspan="2" style="width: 496px" align="center">
                        &nbsp;</td>
                </tr>
                <tr>
                    <td colspan="2" style="width: 496px">
                        <asp:Label ID="Label3" runat="server" Font-Size="Smaller" Text="商品名称：" Width="65px"></asp:Label><asp:TextBox ID="TxtName" runat="server"></asp:TextBox>
                    </td>
                </tr>
                <tr>
                    <td colspan="2">
                        <asp:Label ID="Label4" runat="server" Font-Size="Smaller" Text="商品数量："></asp:Label>
        <asp:TextBox ID="TxtNum" runat="server"></asp:TextBox></td>
                </tr>
                <tr>
                    <td colspan="2">
                        <asp:Label ID="Label5" runat="server" Font-Size="Smaller" Text="商品单价："></asp:Label>
        <asp:TextBox ID="TxtPrice" runat="server"></asp:TextBox></td>
                </tr>
                <tr>
                    <td colspan="2" style="width: 496px">
                        &nbsp;<asp:Button ID="BtnUpdate" runat="server" OnClick="BtnUpdate_Click" Text="更新" Width="55px" /></td>
                </tr>
            </table>
        </div>
    </form>

View Code
using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)//首次执行页面时
        {
            GridViewBind();//绑定自定义方法GridViewBind
            if (Request.QueryString["商品编号"] != null)//判断，如果可以获取到id的值，则执行以下操作
            {
                SqlConnection con = new SqlConnection(ConfigurationSettings.AppSettings["strCon"]);
                con.Open();
                SqlDataAdapter ada = new SqlDataAdapter("select * from tb_shopping05 where 商品编号=" + Request.QueryString["商品编号"] + "", con);
                DataSet ds = new DataSet();
                ada.Fill(ds, "tb_shopping05");
                DataRowView drv = ds.Tables["tb_shopping05"].DefaultView[0];
                this.TxtName.Text = drv["商品名称"].ToString();
                this.TxtNum.Text = drv["商品数量"].ToString();
                this.TxtPrice.Text = drv["商品单价"].ToString();
            }
        }
    }
    public void GridViewBind()//绑定GridView控件的自定义方法
    {
        SqlConnection con = new SqlConnection(ConfigurationSettings.AppSettings["strCon"]);
        con.Open();
        SqlDataAdapter ada = new SqlDataAdapter("select * from tb_shopping05", con);
        DataSet ds = new DataSet();
        ada.Fill(ds);
        GridView1.DataSource = ds;
        GridView1.DataBind();
        con.Close();
    }
    protected void BtnUpdate_Click(object sender, EventArgs e)
    {
        try
        {
            SqlConnection con = new SqlConnection(ConfigurationSettings.AppSettings["strCon"]);
            con.Open();
            SqlCommand com = new SqlCommand("update tb_shopping05 set 商品名称='" + this.TxtName.Text + "',商品数量='" + this.TxtNum.Text + "',商品单价='" + this.TxtPrice.Text + "' where 商品编号=" + Request["商品编号"], con);
            com.ExecuteNonQuery();
            GridViewBind();
            Response.Write("<script language=javascript>alert('恭喜您！信息更新成功！')</script>");
        }
        catch
        {
            Response.Write("<script language=javascript>alert('很遗憾！信息更新失败！')</script>");
        }
    }
}