Work Around For Whitespaces : <p>How can I get rid of whitespaces when I don't need them?</p>

<p>I have to check checboxes then add them to a listbox then pass them to a textbox(multiline). Then of course I have to put at the end
    Listbox1.Items.Add(Environment.NewLine);</p>

<p>This make the items on the textbox separated. But I want that whitespace to be gone when I'm going to process the data. How to remove it?</p>
