public void Save()
 {
     try
     {
         context.SaveChanges();
     }
     catch (DbEntityValidationException e)
     {
         foreach (var eve in e.EntityValidationErrors)
         {
             Console.WriteLine("Entity of type \"{0}\" in state \"{1}\" has the following validation errors:",
                               eve.Entry.Entity.GetType().Name, eve.Entry.State);
             foreach (var ve in eve.ValidationErrors)
             {
                 Console.WriteLine("- Property: \"{0}\", Error: \"{1}\"",
                                   ve.PropertyName, ve.ErrorMessage);
             }
         }
         throw;
     }
 }