Security Options

Question

Can someone please refer me to a site or tutorials in the ability to impliment windows based security integration to C# Applications? I would like to have a window form load on app start that will prompt for a username / password / group for security purposes. When the user enters this information into the form then their settings will be automatically set within the application. For example I don't want to allow a user to have access to the Employee's / Payroll area of the application for security purposes but want them to have access to Invoicing, Customer Data and Inventory Management. Is there a site to which can help with this or is there possibly someone on this forum that could help? Thanks, David Watson