ขอความช่วยเหลือครับไม่สามารถดึงข้อมูลจาก Webservice ได้ครับ

 [WebMethod()]
        public DataTable login(string username)
        {
            SqlConnection objConn = new SqlConnection();
            SqlCommand objCmd = new SqlCommand();
            SqlDataAdapter dtAdapter = new SqlDataAdapter();
            DataSet ds = new DataSet();
            DataTable dt = null;
            string strConnString = null;
            StringBuilder strSQL = new StringBuilder();
            strConnString = "Server=192.168.1.106;UID=sa;PASSWORD=12345678;database=test;Max Pool Size=400;Connect Timeout=5000;";
            strSQL.Append("SELECT * FROM  temp WHERE id = '" + username + "' ");
            //strSQL.Append(" WHERE [SRCT_Code] = '" + strCusID + "' ");
            objConn.ConnectionString = strConnString;
            var _with1 = objCmd;
            _with1.Connection = objConn;
            _with1.CommandText = strSQL.ToString();
            _with1.CommandType = CommandType.Text;
            dtAdapter.SelectCommand = objCmd;
            dtAdapter.Fill(ds);
            dt = ds.Tables[0];
            dtAdapter = null;
            objConn.Close();
            objConn = null;
            return dt;
        }