How to Deleting the Empty columns in Crystal reports using Formulafield?

Question

Hi,to all

I have written one Formulafield for combination of Name,address,State,District
using camas(,).
Ex:Amit,Hyderabad,Ap,Hyderabad

my requirement is when i am not enter the name i will get following way

Hyderabad,Ap,Hyderabad


Help me
thanks inadvance