[RESOLVED] multiple items in a listbox

[Triumph]

I am trying to remove multiple selected items in a listbox, this code isnt working:

private void btnRemove_Click(object sender, System.EventArgs e)
{
	for (int x = 0; x < lstFiles.Items.Count; x++)
	{
		if (lstFiles.SelectedIndices.Contains(x))
		{
			lstFiles.Items.RemoveAt(x);
		}
	}
}

Not all selected items get removed, but most of them do.
edit: seems its the first thing selected that doesnt get removed.