How to logoff from a SharePoint 2010 site using a c# client?

Question

I found this Remote Authentication in SharePoint Client Object Model which has examples to popup a IE window in order to get all the cookies for remote SharePoint access. Ideally, the program popups a window to the site, asks the user to login, and then disappears. The program then can insert items into the SharePoint site.

Problem Description

I observed that this example application pops up a window but redirected to our company's example SharePoint site, instead of my site, and it didn't ask me to log in. Then if I close this window manually the clientContext (from ClaimClientContext.GetAuthenticatedContext(siteUrl) ) in the example code will be null pointer. To fix this, I first manually open an IE window, go to my site, I will be automatically logged in (which I think that's the problem since the example application wasn't able to get a cookie because there was no logging in), then if I manually log off from the IE window, run the example application, it will pop up a window, seems it automatically log in and then the window disappeared and the items can be added to the list.

My Question

Is there a way to programmatically log off the SharePoint site from the application at first?

Answer 1

Problem is in authorization cookie. You must delete FedAuth cookie to "logout".