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());

}

public class ComboboxItem

{

    public string Text { get; set; }

    public object Value { get; set; }

​

    public override string ToString()

    {

        return Text;

    }

}