private void Validate(DBEntities context, MetadataEntityModel model)
 {
     //string res = MetadataEntityValidator.CheckTableName(context, model.Id, model.TableName);
     //if (res.Length > 0)
     //    ModelState.AddModelError("TableName", res);
 }
        public ActionResult Edit(Guid id, MetadataEntityModel model, string button)
        {
            using (DBEntities context = Settings.CreateDataContext())
            {
                Validate(context, model);

                if (!ModelState.IsValid)
                {
                    return View(model);
                }

                MetadataEntity target = null;
                if (model.Id != Guid.Empty)
                {
                    target = MetadataEntityHelper.Get(model.Id, context);
                    if (target == null)
                    {
                        ModelState.AddModelError("", Resources.Resource.RowNotFound);
                        return View(model);
                    }
                }
                else
                {
                    target = new MetadataEntity();
                    target.Id = Guid.NewGuid();
                    context.AddToMetadataEntity(target);
                }

                Mapper.CreateMap<MetadataEntityModel, MetadataEntity>().ForMember("Id", f => f.Ignore());
                Mapper.Map(model, target);

                try
                {
                    context.SaveChanges();
                }
                catch (Exception ex)
                {
                    var sb = new StringBuilder(Resources.Resource.SaveError + ": " + ex.Message);
                    if (ex.InnerException != null)
                        sb.AppendLine(ex.InnerException.Message);
                    ModelState.AddModelError("", sb.ToString());
                    return View(model);
                }

                if (button == "SaveAndExit")
                    return RedirectToAction("Index");
                else
                    return RedirectToAction("Edit", new {target.Id});
            }
        }