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IsolatedStorageFile.GetUserStoreForApplication()) { //If user choose to save, create a new file using (IsolatedStorageFileStream fs = isf.CreateFile(fileName)) { using (StreamWriter write = new StreamWriter(fs)) { write.WriteLine(strTextToSave); } } } } You are now ready to run your application. Press F5 to launch it, type Hello, world in the text box shown, and press the Back button. Remember, pressing the Back button past the first page of an application results in termination of that application. Click Yes on the message box prompting you to save your work before leaving. Next, re-launch your application. You should see Hello, world displayed in the text box but you don t. What happened If you guessed that we still have to retrieve the values previously stored inside the isolated storage, you are correct. We will retrieve those values in the next section, together with looking at the best practices for retrieving this information.

The Edit All Items page contains links to edit individual to-do list items. This uses a separate JSP page.

The first type of recursion we ll look at in detail is recursion to perform a numeric calculation. XPath provides operators and functions for some numeric calculations, but not all of them. For example, XPath doesn t offer functions for getting the square root of a number or getting the power of a number.

Note Writing stylesheet functions for these functions can be quite tricky; usually you can use an extension

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We can edit a to-do list item from the editItemPage.jsp page. Like the Edit All Items page, this JSP page is for the EDIT portlet mode. We create a form that sends an action request with the command EDIT to the portlet s action request handler, which updates the appropriate to-do list item. The form is populated with the contents of the to-do list item, using the <c:out> tag from the core JSTL tag library. We use the <c:set> tag to set the expression variable item to the ToDoListBean object from the ToDoList list. This form also uses a <portlet:actionURL> JSP tag as the form s action, and we used the POST HTTP method for the form again (because it is required for portlets).

Microsoft guidelines state that within the Application_Launching event there should not be any isolated storage access or web service calls, so that the application comes up and is available for use as quickly as possible. Instead, Microsoft recommends asynchronously loading values from the isolated storage of an application once the application is fully loaded. This set of restrictions forces us as developers to code the initialization routines using the following two guidelines: 1. 2. Invoke data initialization and retrieval on a separate thread so as to maximize the responsiveness of an application. Perform application initialization inside the OnNavigatedTo method of the PhoneApplicationPage class.

function instead, as you ll see in 14, or you can reuse utility functions such as those from EXSLT (http://www.exslt.org/math). I m really only including these functions here as examples of recursion in use.

In these kinds of functions, you use a parameter to keep track of the value attained so far, and only emit that value when you come to the end of the recursion. This parameter is only ever used within the recursion, so there are usually two function declarations that support the function: one that provides the user interface to the function (without the extra parameter) and another that actually carries out the recursion.

<%@ page session="true" %> <%@ taglib uri='/WEB-INF/tld/portlet.tld' prefix='portlet'%> <%@ taglib uri="/WEB-INF/tld/c.tld" prefix="c" %> <%@ page import="java.util.*"%> <c:set var="item" value="${ToDoList[param.ITEM_ID]}"/> <a href="<portlet:renderURL portletMode="edit"/>">Back to Edit All Items</a> <form action="<portlet:actionURL> <portlet:param name="COMMAND" value="EDIT"/> <portlet:param name="ITEM_ID" value="<%=request.getParameter("ITEM_ID")%>"/> </portlet:actionURL>" method="post"> Description: <input type="text" size="30" value="<c:out value="${item.description}"/>" name="DESCRIPTION"> <br> Priority: <input type="text" size="2" value="<c:out value="${item.priority}"/>" name="PRIORITY"> <br> <input type="submit" text="Create"> </form>

When a function parameter should never actually be used by a user, I usually put the function that Tip accepts the extra parameter in a different namespace. For example, the math:squareRoot() function would be the one that the user calls (without the extra parameter), with the private-math:squareRoot() function being the one that actually does the work (with the extra parameter).

In the next walkthrough, you will add the necessary methods to properly load application data from the isolated storage. 3. You will continue modifying the Tasks project that you have worked with throughout this chapter. At the top of MainPage.xaml.cs, add the following using directive:

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