store/store_List.aspx.cs

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using System;
using System.Collections;
using System.Configuration;
using System.Data;
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;

public partial class store_List : System.Web.UI.Page
{
   
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
        DataSet ds = SqlHelper.ExecuteforDataSet("select pid,pname from products");
        ddlpid.DataSource = ds;
        ddlpid.DataTextField = "pname";
        ddlpid.DataValueField = "pid";
        ddlpid.DataBind();
        ddlpid.Items.Insert(0, new ListItem("---全部---", ""));

            BindData();
        }
    }

    // 绑定
    private void BindData()
    {       
        string where = " where 1=1 ";

        if (ddlpid.SelectedValue!= "")
        {
            where += " and a.pid=" + ddlpid.SelectedValue + "";
        }



        GridView1.DataSource = SqlHelper.ExecuteforDataSet("select a.*,b.pname,stand,pack,units from store a left join products b on a.pid=b.pid " + where + " order by sid desc");
        GridView1.DataBind();

    }

    /// <summary>
    /// 分页事件
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        GridView1.PageIndex = e.NewPageIndex;
        BindData();
    }
   
    // 搜索
    protected void btnSearch_Click(object sender, EventArgs e)
    {