using (AppSecurityDataContext dc = GetDataContext()) { tblUsersInApplication uia = new tblUsersInApplication { UserId = um.UserId, ApplicationId = LoginCredentials.ApplicationId, LastLoginDateTime = DateTime.Now }; try { dc.SubmitChanges(); } catch (Exception e) { Error = e; } }I get no exceptions. Runs fine. The date/time doesn't show up in the SQL table after it runs.