TB TO LOOK UP LIST ADD TO COLLECTION

[dubiousp]

Good evening I have almost concluded an app I wonder if some one could point me to the following. My text box currently seaches its collection then puts it into a list box

Is it possible to add a value if not in the collection to list box and back to collection so when searched next time it appears

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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