private void Add()
        {
            Maschinenart newMaschinenart = new Maschinenart();

            Maschinenarten.Add(newMaschinenart);

            walkthrowGridUpdaterMethod();
        }
        private void Delete()
        {
            if (maschinenarten != null)
            {
                int index = Maschinenarten.IndexOf(currentMaschinenart);
                currentMaschinenart.ChangeTracker.State = ObjectState.Deleted;
                Maschinenarten[index] = currentMaschinenart;

                walkthrowGridUpdaterMethod();

                //kunden.Remove(currentKunde);
            }
            Console.WriteLine("Delete");
        }