Workaround for OAuth autorization

Many social services use OAuth to get access to their api. But it's uncomfortably to do some stuff. For example i want to create application which store users login and password in sql server and update information about profile info in different socia开发者_运维知识库l networks. Application is windows service not website or something. So if i know login and password can i get OAuth access token without any actions from user?

You definitely won't get the user's password, unless You sniff it or something else. Highly unrecommended unless You are writing malware - which I don't approve.

But if you are doing a legitimate app, then check this out: http://www.dotnetopenauth.net/