private void Window_Loaded(object sender, RoutedEventArgs e) { dateManufacture.GetBindingExpression(DatePicker.SelectedDateProperty).UpdateSource(); NameBook.GetBindingExpression(TextBox.TextProperty).UpdateSource(); NameBook.GetBindingExpression(TextBox.TextProperty).UpdateSource(); tbPrice.GetBindingExpression(TextBox.TextProperty).UpdateSource(); Category.GetBindingExpression(ComboBox.SelectedItemProperty).UpdateSource(); cbAuthor.GetBindingExpression(ComboBox.SelectedItemProperty).UpdateSource(); }