public void InitialDatabse() { if (!db.Instruments.Any()) { data = new dataManager(); Instrument makita = new Instrument { Manufacturer = "Makita" }; Instrument bosh = new Instrument { Manufacturer = "Bosh" }; makita.Circulars.AddRange(data.GetCirculars(makita)); makita.Drills.AddRange(data.GetDrills(makita)); bosh.Drills.AddRange(data.GetDrills(bosh)); bosh.Circulars.AddRange(data.GetCirculars(bosh)); db.Instruments.Add(makita); db.Instruments.Add(bosh); db.SaveChanges(); } }