I am working on a project for a property management company. There is the back end system that stores all of the tenants and property portfolios, and a front end website that a
You can basically use it as you were with the web application, they key is that you must have the same machinekey values for your application AND the web application. Otherwise the passwords will not encrypt or decrypt in the proper manner.
Here is a tutorial that might help you out a bit on using it from a windows app. The process should be the same for your windows service.