ShowCar.aspx.cs

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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.IO;
using System.Data.SqlClient;

public partial class ShowCar : System.Web.UI.Page
{
    SqlHelper data = new SqlHelper();
    SqlConnection sqlconn = new SqlConnection(ConfigurationManager.ConnectionStrings["sqlcon"].ConnectionString);
    protected void Page_Load(object sender, EventArgs e)
    {
        this.Title = "二手汽车网上销售系统";
        if (!IsPostBack)
        {
            string sql = "select * from CarInfo where CarID=" + Request.QueryString["id"].ToString();
            getdata(sql);

            string sql1 = "update   CarInfo set  CarClick=CarClick+1  where CarID=" + Request.QueryString["id"].ToString();
            getdata(sql1);
        }
    }
    private void getdata(string sql)
    {
        SqlDataReader dr = data.GetDataReader(sql);
        if (dr.Read())
        {
        
            Label2.Text = dr["CarName"].ToString();
            Label4.Text = dr["CarPrice"].ToString();
            Label5.Text = dr["CarNum"].ToString();
            DIV1.InnerHtml = dr["CarIntroduce"].ToString();
            Label6.Text = dr["CarClick"].ToString();
            iGPhoto.ImageUrl = "files/" + dr["CarPhoto"].ToString();
            Label3.Text = dr["CarTypeName"].ToString();
            Hidden1.Value = dr["CarTypeID"].ToString();
            Label1.Text = dr["CarDanWei"].ToString();
            Label8.Text = dr["CarVIPPrice"].ToString();
        }

    }
    protected void btnShop_Click(object sender, EventArgs e)
    {
        string Orderid;

        if (float.Parse(Label5.Text) < float.Parse(TextBox1.Text))
        {

            Label7.Text = "库存不足";
            return;
        }
        else
        {