public static UserNameUnique[] GET_USER_NAME_EXIST_OR_NOT() { List <UserNameUnique> details = new List <UserNameUnique>(); try { var DT = CRBusinessLogicLayer.GET_USER_NAME_EXIST_OR_NOT(); if (DT.Rows.Count > 0) { details.AddRange(from DataRow dtrow in DT.Rows select new UserNameUnique { CustomerId = dtrow["LOGIN"].ToString() }); } } catch (Exception ex) { logfile.ErrorFormat(ex.Message); return(null); } return(details.ToArray()); }