public void AddNewItem()
        {
            ExceptionCatcher.ExceptionFinder(() => {
                using (SDB sdbContext = new SDB())
                {
                    if (musteri == null)
                    {
                        Musteri musteri       = new Musteri();
                        musteri.MusteriAdi    = customerName.Text;
                        musteri.MusteriSoyadi = customerLastname.Text;
                        musteri.MusteriAdres  = customerAddress.Text;
                        musteri.MusteriTelNo  = customerTelNo.Text;
                        DAL.DAL dal           = new DAL.DAL();

                        dal.NewRecordMus(musteri);

                        grid_customerForm.Visibility         = Visibility.Collapsed;
                        gridControl_customerList.ItemsSource = null;
                        GetMusteriList();
                    }
                    else
                    {
                        Musteri cust       = new Musteri();
                        cust.MusteriID     = musteri.MusteriID;
                        cust.MusteriAdi    = customerName.Text;
                        cust.MusteriSoyadi = customerLastname.Text;
                        cust.MusteriAdres  = customerAddress.Text;
                        cust.MusteriTelNo  = customerTelNo.Text;

                        DAL.DAL dal = new DAL.DAL();
                        dal.UpdateRecordMus(cust);
                        MainWindow window = (MainWindow)Window.GetWindow(this);
                        window.RibbonController();
                        grid_customerForm.Visibility         = Visibility.Collapsed;
                        gridControl_customerList.ItemsSource = null;
                        GetMusteriList();
                        ClearForm();
                    }
                }
            });
        }