3. 3

4. 4

5. private void saveButton_Click(object sender, RoutedEventArgs e) { saveText("jot.txt", jotTextBox.Text); }

6. private void saveText(string filename, string text) { using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication()) { using (IsolatedStorageFileStream rawStream = isf.CreateFile(filename)) { StreamWriter writer = new StreamWriter(rawStream); writer.Write(text); writer.Close(); } } }

10. private void loadButton_Click(object sender, RoutedEventArgs e) { string text; if ( loadText("jot.txt", out text ) ) { jotTextBox.Text = text; } else { jotTextBox.Text = "Type your jottings here...."; } }

11. try { using (IsolatedStorageFileStream rawStream = isf.OpenFile(filename, System.IO.FileMode.Open)) { StreamReader reader = new StreamReader(rawStream); result = reader.ReadToEnd(); reader.Close(); } } catch { return false; }

12. 12

13. 13

14. 14

15. 15

16. class Person { public string Name; public string Address; public string Phone; }

17. Dictionary Personnel = new Dictionary ();

18. Person p1 = new Person { Name = "Rob", Address = "His House", Phone = "1234" }; Personnel.Add(p1.Name, p1);

19. Person findPerson = Personnel["Rob"];

20. if (Personnel.ContainsKey("Jim")) { // If we get here the dictionary // contains Jim }

21. 21

22. 22

23. private void saveText(string filename, string text) { IsolatedStorageSettings isolatedStore = IsolatedStorageSettings.ApplicationSettings; isolatedStore.Remove(filename); isolatedStore.Add(filename, text); isolatedStore.Save(); }

27. 27

28. 28

29. private bool loadText(string filename, out string result) { IsolatedStorageSettings isolatedStore = IsolatedStorageSettings.ApplicationSettings; result = ""; try { result = (string)isolatedStore[filename]; } catch { return false; } return true; }

30. 30 result = ""; try { result = (string) isolatedStore[filename]; } catch { return false; }

31. 31

32. 32

33. 33