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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.Data.SqlClient;


public partial class Test : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
     
          this.GridView1.DataSource = GetHouseInfo();
          this.GridView1.DataBind();
       
       
     

    }
      private DataTable GetHouseInfo()
      {
          string con = "Data Source=\\SQLEXPRESS;Initial Catalog=a;Integrated Security=True";

          DataSet ret = new DataSet();

          using (SqlConnection connection = new SqlConnection(con))
          {
              string queryString = "select Name from a where hCity='" + DropDownList1.SelectedValue + " '";