Import Address Book from Gmail/Hotmail/Yahoo using C# and ASP.NET

Hi can somebody tell me how to import all of my contacts from gmail, yahoo, hotmail and so on.. and i want to send an invitation for all my contacts?

How can i achieve this?

Solution

Check the .NET Address Book API's of those providers:

Google Contacts Data API
- Retrieving contacts (C#)
Windows Live Contacts API
- Code samples (C#)
Yahoo! Address Book API
- Yahoo! Web Service REST Calls (C#)
- Contacts API URI

Is this declaration UB?
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