TB TO LOOK UP LIST ADD TO COLLECTION

[dubiousp]

Good evening I currently have a code that uses a text ox as look up search from the auto look up collection in TB properties. Currently list box populates lovely,, is there a way I can add the value of the text box back to collection and list box if not already in the collection list

rivate void btnmedsadd_Click(object sender, EventArgs e)
{
listboxmeds.Items.Add(tbdrug.Text

}

private void btnmedsremove_Click(object sender, EventArgs e)
{
if (listboxmeds.SelectedIndex != -1);
{
listboxmeds.Items.RemoveAt(listboxmeds.SelectedIndex);

}
}

private void btnmedsclear_Click(object sender, EventArgs e)
{
listboxmeds.Items.Clear();

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