private void UpdateId_Click(object sender, EventArgs e)
{
if (idTextBox.Text != "")
{
long id = 0;
if (long.TryParse(idTextBox.Text, out id))
{
ItemBase[] items = new ItemBase[itemBox.Items.Count];
itemBox.Items.CopyTo(items, 0);
if (items.FirstOrDefault(x => x.ItemId == id && x.ItemId != (itemBox.SelectedItem as ItemBase).ItemId) != null)
{
Interaction.MsgBox("ID already in use", MsgBoxStyle.Exclamation);
idTextBox.Text = "";
}
else
{
idLabel.Text = idTextBox.Text;
idTextBox.Text = "";
}
}
else
{
Interaction.MsgBox("ID must be a number.", MsgBoxStyle.Exclamation);
idTextBox.Text = "";
}
}
}