private string connStr = ConfigurationManager.ConnectionStrings["ruanmou"].ToString();        //2：实例化一个SqlConnection对象，用于和数据库建立起连接        SqlConnection con;        SqlCommand cmd;        SqlDataReader read;        private SqlConnection ConDb()        {            con = new SqlConnection(connStr);            con.Open();            return con;        }        public string SqlWhere()        {            StringBuilder sb = new StringBuilder();            sb.Append(string.Format("select top {0} * from RNews where 1=1 order by NewsId desc", 4));            return sb.ToString();        }        public string Bind()        {                       StringBuilder sb = new StringBuilder();            //List<RNews> list = RNewsDAL.m_rnews.GetList(SqlWhere());            //foreach (var a in list)            //{            //    sb.Append(a.Title);            //}            //return sb.ToString();            using (ConDb())            {                string sql = SqlWhere();                cmd = new SqlCommand(SqlWhere(), con);                using (read = cmd.ExecuteReader())                {                    if (read.Read())                    {                        foreach (var news in read)                        {                            sb.Append(string.Format(@" <li><a target=""_blank"" href=""NewsPage.aspx?NewsId={0}"">【新闻】{1}</a></li> ", read["NewsId"], read["Title"]));                        }                    }                } return sb.ToString();            }