To open the home pages as per the cities

Question

Hi
I am creating web site in C#.net with sql server2005.
Here, I want to develope the home pages as per the city, where user visits our site.
Means, If user is in Pune city, then he will see the home page created for Pune city,
if user is from Mumbai then he will see the home page created for mumbai city.
Please tell me how can we do this functionality.
Thanks,
Mandar