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 开发者_JAVA技巧can i achieve this?

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