i am developing a custom dnn moudle for the regiseration process. I am getting a problem in that and my problem is
I have Country dropdownlist which list almost all the world country and i have textbox for the zip code. When a user enter zipcode i have to valide it with country, That the zipcode belongs to user selected cuntry. There are solutions which comes to my mind

1- I pass the user entered zipcode to some webservice and it return me the country name or code and i compare it with the user selected coutnry. I have search a lot on the internet to find a web service but unable to find it.

2- second solution that come to my mind to build a lookup table in my database to store the zipecode and country and validate the zipcode from the lookup table by passing the zipcode. I have searched on the internet to get the script or zipcode list and found only usa and candian zipcode. which does not complete solve my problem

Can any body help me out to solve this problem.