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();
 }