Pro Silverlight 2 in C# 2008

Chapter 15. Isolated Storage

Silverlight code isn't permitted to write to arbitrary locations on the file system (or read from them). Obviously, if this ability were possible, it would break the web browser's secure sandbox model. However, Silverlight applications that need to store data permanently still have an option. They can use a feature called isolated storage.

Isolated storage gives you access to a small segment of hard disk space, with certain limitations. For instance, you won't know exactly where your files are being stored. You also won't be able to read the files left by another Silverlight application or recorded for another user. In essence, isolated storage provides carefully restricted, tamperproof file access for applications ...