User1107498534 posted
The book "Asp Net 2.0 Security Membership And Role Management" published by Wrox is a very good book.
There's also lots on MSDN about authentication through AD -
http://msdn.microsoft.com/en-us/library/ms998360.aspx
http://www.c-sharpcorner.com/UploadFile/rohit_kshirsagar/FormsAuthenticationActiveDirectory11262005074248AM/FormsAuthenticationActiveDirectory.aspx