RowVersion failed optimistic concurrency

[poooria]

Hi everybody I have these classes public abstract class BaseEntity { [Key] public int Id { get; set; } [Timestamp] public byte[] RowVersion { set; get; } } public class Calendar : BaseEntity { public string Title {get; set;} public virtual ICollection Days { get; set; } } public class Day : BaseEntity { public int DayNo { get; set; } public string Title { get; set; } }

and i used generic repository with unit of work pattern so i have DbContext class like this: public class BaseDbContext : DbContext, IUnitOfWork { public virtual void UpdateWithCollection(T entity, Expression<Func<IUpdateConfiguration, object>> mapping) where T : BaseEntity ,new() { this.UpdateGraph(entity, mapping); } } and in my controller class i used Automapper to map the viewmodels to models like this public MyActionResult Edit(CalendarViewModel calendar) { if (ModelState.IsValid) { var ent = Mapper.Map<CalendarViewModel, Calendar>(calendar); //var ent = _calendarService.GetById(calendar.Id, true);// second parameter tell the service to fetch the object in detach state _uow.UpdateWithCollection(ent, x => x.OwnedCollection(p => p.Days)); _uow.SaveChanges(); } return new MyActionResult(); } UpdateGraph is throw exception 'RowVersion failed optimistic concurrency'. when i remove the mapper line and get object like commented in controller it is working fine

[refactorthis]

Does your viewModel contain the rowversion or timestamp? Looks to me like it doesn't or is not mapping this value back to the entity you are updating.

[refactorthis]

Closing as no response - please comment if need further help