public static string loginUser(List<string> _arr) { DataTable dummy = new DataTable(); SystemObjects.SBObj _sbobj = new SystemObjects.SBObj(); _sbobj.EID = _arr[0].ToString(); DataSet ds = new DataSet(); try { dummy.Merge(_sbobj.LoginUser()); ds.Tables.Add(dummy); } catch (Exception ex) { } return ds.GetXml(); }