无法获取IF语句以从ComboBox Selection C#更新TextBlock

<ComboBox x:Name="comboBox" SelectionChanged="ComboBox_SelectionChanged">
    <ComboBoxItem Content="Option 1" />
    <ComboBoxItem Content="Option 2" />
    <ComboBoxItem Content="Option 3" />
</ComboBox>

<TextBlock x:Name="textBlock" />

private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    ComboBoxItem selectedItem = comboBox.SelectedItem as ComboBoxItem;
    if (selectedItem != null)
    {
        string selectedOption = selectedItem.Content.ToString();
        textBlock.Text = "Selected option: " + selectedOption;
    }
}