Page.User.role authorization not working

Page.User.role authorization not working.I were migrating form authentication into window authentication mode.After that trying to use all user role in window authentication,
Admin,Entry,Team Lead, etc
 no roles available.
Page.User.IsInRole("Manager") = False giving,Already i declared this user as manager while adding record.But still Page.User.IsInRole("Manager") giving false result.
Plaese help me how to solve it.

Thanks,
Vino