public async Task SetOwnerAsync(Entity newOwner) { // Set locally Owner_Id = newOwner.Id; using (VooperContext context = new VooperContext(VooperContext.DBOptions)) { // Set in DB StockObject dummy = new StockObject { Id = this.Id, Owner_Id = Owner_Id }; context.Attach(dummy); context.Entry(dummy).Property(x => x.Owner_Id).IsModified = true; await context.SaveChangesAsync(); } }