Seach.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;

public partial class Seach : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DataSet ds1 = DBHelper.GetDataSet("select   * from TB_Member order by RegisterDate desc");
            this.DataList1.DataSource = ds1.Tables[0];
            this.DataList1.DataBind();



            
                string SQL = "select * from TB_Pro";
                DataSet ds = DBHelper.GetDataSet(SQL);
                this.DropDownList2.DataTextField = "Pro";
                this.DropDownList2.DataValueField = "ID";
                this.DropDownList2.DataSource = ds;
                this.DropDownList2.DataBind();
                GetDrop();
            
        }
   
         
	
    }
    public void GetDrop()
    {
        string SQL = "select * from TB_City where ProID='" + this.DropDownList2.SelectedItem.Value + "'";
        DataSet ds = DBHelper.GetDataSet(SQL);
        this.DropDownList3.DataTextField = "City";
        this.DropDownList3.DataValueField = "ID";
        this.DropDownList3.DataSource = ds;
        this.DropDownList3.DataBind();
    }

    protected void DropDownList2_SelectedIndexChanged(object sender, EventArgs e)
    {
        GetDrop();
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string SQL = "select * from TB_Member where Sex='" + this.DropDownList1.SelectedItem.Text + "' and HunYing='" + this.DropDownList4.SelectedItem.Text + "' and City='" + DropDownList3.SelectedItem.Text+ "'";
        if(!string.IsNullOrEmpty(this.TextBox1.Text))
        {
            SQL=SQL+" and age>"+this.TextBox1.Text;
        }
        if(!string.IsNullOrEmpty(this.TextBox2.Text))
        {