Isolated Storage
//Need IsolatedStorageFilePermission
IsoStorageFile isoStore = IsoStorageFile.GetUserStoreForAssembly(); //The same assembly within different applications always uses the same isolated store when using this method.
IsoStorageFile isoStore = IsoStorageFile.GetUserStoreForDomain(); //The same assembly code will use different isolated stores when used in the context of different applications.
IsoStorageFile isoStore = IsoStorageFile.GetMachineStoreForAssembly();
IsoStorageFile isoStore = IsoStorageFile.GetMachineStoreForDomain();
IsoStorageFile isoStore = IsoStorageFile.GetStore(storeName);
IsolatedStorageFileStream isoFile = new IsolatedStorageFileStream(fileName, FileMode.Create, isoStore);
StreamWriter sw = new StreamWriter(isoFile);