I need to use a web service to be able to sync my iphone app with my Asp.Net website. Data needs to be sent both ways. I haven't started building the web service nor the client yet so before I start, what's the best way to do it? Using SOAP, REST? I understand that support for SOAP or REST isn't built-in in iPhone SDK but are there any ready frameworks for the Iphone to use or do I need to build my own parser?
Do you have some tutorial to recommend?
Thanks!
The one framework that I've used is called JSON Touch. It's an open source project that is very stable. This will give you all you need to make JSON calls back and forth between a web service.
If you're using WCF to create your web service you will have no problem create a JSON web services.
I would highly recommend this over SOAP because there is way too much overhead with SOAP this is not required and will only complicate your development efforts on the iPhone.
If you want to use SOAP this existing question should help.
How to Access Soap Services from the iPhone
chris.