Web/IndexPage/PriceShoping.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.Text;

public partial class IndexPage_PriceShoping : System.Web.UI.Page
{
    PublicClass pc = new PublicClass();
    Bll.ProductBll bp = new Bll.ProductBll();
    Bll.ProdutClassBLL classPro = new Bll.ProdutClassBLL();
    Model.tab_products modelPro = new Model.tab_products();
    public string st;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            pc.GetProductClass(this.DropDownList1);
        }

    } 
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        st = this.DropDownList1.SelectedItem.Text;
        DataTable dtt;
        BindPro(this.DropDownList1.SelectedValue);
        if (strsql.Length==0)
        {
           dtt = classPro.SelectProClass("select * from tab_products where productClassID=" + this.DropDownList1.SelectedValue);
        }
        else
        {
            strsql = strsql.Remove(strsql.Length - 1, 1);
            string[] sql = strsql.ToString().Split('|');

            StringBuilder sele = new StringBuilder();
            sele.Append("select * from tab_products where ");
            for (int i = 0; i < sql.Length; i++)
            {
                sele.AppendFormat(" productClassID={0} or", sql[i]);
            }
            sele = sele.Remove(sele.Length - 2, 2);
            dtt = classPro.SelectProClass(sele.ToString());
        }
        this.DataList1.DataSource = dtt;
        this.DataList1.DataBind();

        
    }

    StringBuilder strsql = new StringBuilder();
   
    private void BindPro(string p)
    {