private void lbAutoSupplier_SelectionChanged(object sender, SelectionChangedEventArgs e) { lbAutoSupplierName.Visibility = Visibility.Collapsed; if (lbAutoSupplierName.SelectedIndex != -1) { SupplierModel suplier = new SupplierModel(); suplier = _supliers.FirstOrDefault(x => x.SupplierName == Convert.ToString(lbAutoSupplierName.SelectedItem)); supplierName_.Text = Convert.ToString(lbAutoSupplierName.SelectedItem); _purchaseOrder = controllerPurchase.GetPurchaseBySupplierId(UserModelVm.CompanyId, UserModelVm.BranchId, suplier.Id.Value); _directPurchase = controllerPurchase.GetDirectPurchaseBySupplierId(UserModelVm.CompanyId, UserModelVm.BranchId, suplier.Id.Value); supplierCode = suplier.Id.Value; EnableInvoiceType(); } }