asp.net数据库刷新问题

using (SqlConnection conn = new SqlConnection())
{

        conn.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        int History_num = 0;

        SqlCommand Cmd = new SqlCommand();


        String SelectSql = "SELECT [history_num] FROM [time_table]";
        Cmd.CommandText = SelectSql;
        Cmd.Connection = conn;
        conn.Open();
        SqlDataReader dr = Cmd.ExecuteReader();
        if (dr.Read())
        {
            History_num = dr.GetInt32(0);
        }
        history_num.Text = History_num.ToString();
        conn.Close();
        conn.Dispose();
    }
            数据成功更新到数据库，在主页page_load中加入这段代码，前段通过控件设置1秒自动刷新，执行后显示数据不是实时数据，后台手动刷新数据库后前段立即显示实时数据，请问有什么解决办法

http://bbs.csdn.net/topics/390492061