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private void Form1_Load(object sender, System.EventArgs e)
{
    //アイテムを追加する
    string[] strItems = {"Banana", "Apple", "Lemon"};
    domainUpDown1.Items.AddRange(strItems);
}

private void button1_Click(object sender, System.EventArgs e)
{
    //アイテムを並べ替える
    domainUpDown1.Sorted = true;
}