Mixing Forms and Windows Security in ASP.NET

Well... In a asp.net application that I'm working on these days I have to implement both Forms and Windows authentications. If user got windows credentials we have to capture the Windows username, if possible, and otherwise redirect users to a login screen.

Seems difficult ha... yes it is. But luckily I found a good article that describing how to do that.

Check this out
http://msdn.microsoft.com/asp.net/articles/security/default.aspx?pull=/library/en-us/dnaspp/html/mixedsecurity.asp#mixedsecurity_topic1