How to save mobile contacts to PDA ( Personal Distal Assistance)

Question

Hi,
I am SivaRamaRaju working as a .net developer.

In my asp.net mobile web application,I am displaying the list of contacts which are in the database. The problem here is I want to save the list of contacts in the mobile application to PDA (Personal Distal Assistance)

Can anybody help me how can I save these list of contacts to PDA

Thanks and regards
Siva.