ShowBook.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 ShowBook : System.Web.UI.Page
{
    SqlHelper data = new SqlHelper();
    SqlConnection sqlconn = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
    protected void Page_Load(object sender, EventArgs e)
    {
        this.Title = "茶叶销售管理系统";
        if (!IsPostBack)
        {
            data.RunSql("update BookInfo set BookClick=BookClick+1 where BookID=" + Request.QueryString["id"].ToString());
            string sql = "select * from BookInfo where BookID=" + Request.QueryString["id"].ToString();
            getdata(sql);
        }
    }
    private void getdata(string sql)
    {
        SqlDataReader dr = data.GetDataReader(sql);
        if (dr.Read())
        {

            Label2.Text = dr["BookName"].ToString();
            Label4.Text = dr["BookPrice"].ToString();
            Label1.Text = dr["BookPrice1"].ToString();
            Label5.Text = dr["BookNum"].ToString();
            DIV1.InnerHtml = dr["BookIntroduce"].ToString();
            Label6.Text = dr["BookClick"].ToString();
            iGPhoto.ImageUrl = "files/" + dr["BookPhoto"].ToString();
            Label3.Text = dr["BookTypeName"].ToString();
            Hidden1.Value = dr["BookTypeID"].ToString();
        }

    }
    protected void btnShop_Click(object sender, EventArgs e)
    {
        int store = Convert.ToInt32(Label5.Text);//获取库存买数量
        int num = 0;
        try
        {
            num = Convert.ToInt32(TextBox1.Text);//获得购买数量
        }
        catch (Exception ex)
        {
            Alert.Alertjs("数量格式不正确！");
            return;
        }
        if (store < num)//判断是否大于库存数量
        {