I'm integrating a desktop app with SF using a c# component. I've created a login screen and can happily access all the fetures i want in my org from the application.
The problem i'm having is checking whether the sessionID (stored in a file after log on) is valid, so that if it is the user won't get prompted to login again the next time they use the c# component to interact with SF.
The only way i can see to do this from the docs is by using LoginResult which would require the user to add their username & password again... I'm sure im missing something, so very grateful for any suggestions!