own ref( dont respnds )

using System.Data.SqlClient;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Net.Mail;
using System.Text.RegularExpressions;
using System.Net;
using System;
using System.Collections;
using System.Data;
using System.Web.UI.WebControls;
using Microsoft.VisualBasic;
using System.Text;
//namespace styr
//{
    public class dbfunction
    {
        public static SqlConnection con = new SqlConnection();
        public static SqlCommand cmdobj, cmd1, cmd2, cmd3;
        public static SqlDataReader dtr_main;
        public static DataTable dt_properties = new DataTable();
        public ...