private void addbook_Click(object sender, RoutedEventArgs e)
{
ModifyBook addBookForm = new ModifyBook(user);
addBookForm.Show();
this.Hide();
}
private void editButton_Click(object sender, RoutedEventArgs e)
{
ModifyBook modify = new ModifyBook(user);
modify.book = book;
modify.populateFields();
modify.Show();
this.Hide();
}