C# - Editierbare DataGridViewComboBox-Spalten

/// <summary>
/// Behandlung für das EditingControlShowing-Ereignis von DataGridView
/// </summary>
private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
{
    DataGridViewComboBoxEditingControl ctrl = e.Control as DataGridViewComboBoxEditingControl;
    if (ctrl != null)
        ctrl.DropDownStyle = ComboBoxStyle.DropDown;
}