I want to get all contact list of email from Gmail, Yahoo or Hotmail in the ASP.NET and C#.
Instead of enter username and password on my page (and call the API for authentication), I am thinking to redirect to Gmail, Yahoo and Hotmail respectively for authentication (is it something called oAuth?) and authorization (consent) ?
It should redirect back to my page with all the contact list.
Any ideas or sample codes, especially Yahoo.
Thanks in advance.
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