สอบถามการเลือกดึงข้อมูลจากฐานข้อมูลมาโชว์ใน Combobox C#

public class ComboboxItem
{
    public string Text { get; set; }
    public object Value { get; set; }

    public override string ToString()
    {
        return Text;
    }
}

private void Test()
{
    ComboboxItem item = new ComboboxItem();
    item.Text = "Item text1";
    item.Value = 12;

    comboBox1.Items.Add(item);

    comboBox1.SelectedIndex = 0;

    MessageBox.Show((comboBox1.SelectedItem as ComboboxItem).Value.ToString());
}

ComboBox item = new ComboBox();

                while(myReader.Read())
                {
                    item.Text = myReader.GetString("type_name");
                    item.Value = myReader.GetString("type_name");
                    type.Items.Add(Text);
                    type.SelectedIndex = 0;
                }

public override string ToString()
        {
            return Text;
        }