newbie question - manipulate Listbox.Items.Add?

Question

I have a listbox where I list e-mail addresses, separated by "; ". This code:

 ListBoxEmailNewsletter.Items.Add(dr[0] + "; ");

makes the email addresses appear like this in the listbox:

email address;

email address;

email address;

Is there any way of making them appear like this instead?:

email address; email address; email address;

Thankful for help!