ListBox Control

Question

Dear All

I have a listbox control in which data comes from table States . Table has only one column . Data is stored like this

PB
HR
CHD
DEL

Now in the form in the listbox control it will display all these 4 records . i want in addition to these Listbox control should display "New" at the end in ListBox , when user click on New it should open a form of New States creation and allow to add a new State , and then update the list box. How is it possible using C#

Thanks