C# Combobox (Dropdownstyle = Simple) -- 如何在键入时选择项目

ComboBox comboBox = new ComboBox();
comboBox.DropDownStyle = ComboBoxStyle.Simple;

comboBox.Items.Add("Item 1");
comboBox.Items.Add("Item 2");
comboBox.Items.Add("Item 3");

private void comboBox_KeyPress(object sender, KeyPressEventArgs e)
{
    string text = comboBox.Text + e.KeyChar;
    int index = comboBox.FindStringExact(text);
    if (index >= 0)
    {
        comboBox.SelectedIndex = index;
    }
}

comboBox.KeyPress += comboBox_KeyPress;