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The Previous and Next links have the simple role of incrementing or decrementing the value of the Page query string parameter. Note that the paging controls only appear if there s more than one subpage of products. You find out this detail from the business tier GetProducts... functions, which return the total number of subpages through the howManyPages out parameter: // If browsing a category... if (categoryId != null) { // Retrieve list of products in a category list.DataSource = CatalogAccess.GetProductsInCategory(categoryId, page, out howManyPages); list.DataBind(); } You make the paging controls visible only if the number of subpages is greater than 1: // display paging controls if (howManyPages > 1) When making the paging controls visible, the main challenge is to build the links for Previous and Next. For example, the Next link should be the same as the currently loaded page, except the Page value in the query string should incremented by one, but it shouldn t be enabled if the visitor is on the last page. You do this by browsing through the collection of query string parameters and reconstructing the complete query string: // create the Next link if (currentPage == howManyPages) nextLink.Enabled = false; else { NameValueCollection query = Request.QueryString; string paramName, newQueryString = " "; for (int i = 0; i < query.Count; i++) if (query.AllKeys[i] != null) if ((paramName = query.AllKeys[i].ToString()).ToUpper() != "PAGE") newQueryString += paramName + "=" + query[i] + "&"; nextLink.NavigateUrl = Request.Url.AbsolutePath + newQueryString + "Page=" + (currentPage + 1).ToString(); } The logic that builds the Previous link is similar to the code for the Next link.

Permissions, Instrumentations, and Applications (Oh My!)

This is the last bit of the UI for this chapter. Product lists contain links to the product details pages, which is dealt with by a Web Form named Product.aspx that you ll write in the following exercise.

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So, in essence, this command will open the file; create it if it does not exist already; make sure a new file is not overwritten if the file already exists; and finally, open the file and make it ready for writing to Next, you use the timestamp command to make sure the file has the correct data and time when created The command accepts seven parameters These are a flag, the year, the month, the day, the hour, minutes, and seconds filetimestamp(2, 2010, 12, 25, 12, 34, 56); In this case you pass it false data, but ideally you would obtain the time from a time source such as an RTC (Real Time Clock) chip or a GPS module and then use that data to timestamp the file correctly.

Underneath the element, you may find the following: elements: Indicate the permissions your application will need in order to function properly. elements: Declare permissions that activities or services might require other applications to hold in order to use your application s data or logic. elements: Indicate code that should be invoked on key system events, such as starting up activities, for the purposes of logging or monitoring. elements: Hook in optional Android components, such as mapping services. element: Indicates for which version of the Android SDK the application was built.

1. Add a new Web Form named Product.aspx to your project, based on the BalloonShop.master Master Page. 2. The Web Form opens by default in Source View. The product details page needs to display the product s name in a Label control named titleLabel, the product s description in a Label named descriptionLabel, the price in a Label named priceLabel, and the image in an Image control named productImage. Feel free to arrange these items in any way you like. Here s how we placed them in Product.aspx (note their CssLabel property as well): <%@ Page Language="C#" MasterPageFile="~/BalloonShop.master" AutoEventWireup="true" CodeFile="Product.aspx.cs" Inherits="Product" Title="BalloonShop Product Details Page" %> <asp:Content ID="content" ContentPlaceHolderID="contentPlaceHolder" Runat="Server"> <br/> <asp:Label CssClass="ProductTitle" ID="titleLabel" Runat="server" Text="Label"></asp:Label> <br/><br/> <asp:Image ID="productImage" Runat="server" /> <br/> <asp:Label CssClass="ProductDescription" ID="descriptionLabel" Runat="server" Text="Label"></asp:Label> <br/><br/> <span class="ProductDescription">Price:</span>  <asp:Label CssClass="ProductPrice" ID="priceLabel" Runat="server" Text="Label"></asp:Label> <br/><br/> </asp:Content> 3. Add the following style to BalloonShop.css: .ProductTitle { color: Blue; font-family: Verdana, Helvetica, sans-serif; text-decoration: none; font-size: 24px; font-weight: bold; line-height: 15px; } 4. Let s now read the necessary data from the database to set up the labels and the image. Add the following code to the page s Page_Load event handler method in Product.aspx.cs:

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