Rename Duplicate

[Dwayne Rothe]

Hi All,
Trying to find the easiest way to rename a (new)string if it already exists
in a list!
If a user tries to add an existing name to a list I want it to be named the
same but adding a digit to the end.
e.g Example exists so name new entery to Example(2), Example(2) exists so
name new to Example(3) e.t.c

any ideas woold be appreciated thanx.............

Dwayne Rothe