private void btAdd_Click(object sender, EventArgs e)
{
if (!SelectedFiles.ContainsValue(txtFileName.Text))
{
SelectedFiles.Add(new ComboItem(Path.GetFileName(txtFileName.Text), txtFileName.Text));
LoadListOfFiles();
}
else
{
MessageBox.Show("The file is already in the collection.");
}
txtFileName.Text = String.Empty;
}
