How to make a windows forms application update by itself?

I've Developed a Windows Forms App having about 5 forms intended for students of a particular college. I need to know how to update my app (Updating the attendance percent of the student and so on)by downloading files from the internet or through any other method. I'm looking for a way in which the user does not feel that its too complicated to run the app. I'm not familiar with SQL or databases, but yet I'll try to catch up with any answers of those type.