namespace WinFormsApp
{
    public partial class Form : System.Windows.Forms.Form
    {
        public Form()
        {
            InitializeComponent();
        }

        private void buttonFillCheckedList_Click(object sender, EventArgs e)
        {
            List<string> list = new List<string>();
            list.Add("Каждый");
            list.Add("Программист");
            list.Add("Желает");
            list.Add("Знать");
            list.Add("C#");
            userControlCheckedList.SetCheckedListBoxValues(list);

            userControlCheckedList.CheckedItem = list[3];
        }

        private void buttonClearList_Click(object sender, EventArgs e)
        {
            userControlCheckedList.ClearCheckedListBoxValues();
        }
    }
}