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With the evolution of the Internet, distributed applications are spanning different geographical locations You may have one server residing in the United States with clients talking to it from India It is quite possible that the clients and server are running two entirely different platforms (Windows and Unix, for example) In such cases it is necessary that a standard mode of communication be established between the server and clients so that communication can take place over the Internet That is where web services come into the picture Formally speaking, web services are a programmable set of APIs that you can call over a network by using industry-standard protocols: HTTP, XML, and an XML-based protocol called SOAP (as noted earlier in this chapter, SOAP stands for Simple Object Access Protocol) You can think of a web service as a web-callable component.

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public partial class UserControls_ProductReviews : System.Web.UI. UserControl { protected void Page_Load(object sender, EventArgs e) { // Retrieve ProductID from the query string string productId = Request.QueryString["ProductID"]; // display product recommendations DataTable table = CatalogAccess.GetProductReviews(productId); if (table.Rows.Count > 0) { list.ShowHeader = true; list.DataSource = table; list.DataBind(); } // show or hide the review panel addReviewPanel.Visible = (HttpContext.Current.User != null && HttpContext.Current.User.Identity.IsAuthenticated); } protected void addReviewButton_Click(object sender, EventArgs e) { string customerId = Membership.GetUser( HttpContext.Current.User.Identity.Name) .ProviderUserKey.ToString(); string productId = Request.QueryString["ProductID"]; CatalogAccess.AddReview(customerId, productId, reviewTextBox.Text); Response.Redirect(HttpContext.Current.Request.RawUrl); } } qr code reader

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7. Add the following styles at the end BalloonShop.css: .ReviewHead { font-weight: bold; } .ReviewTable { background: #ccddff; border-bottom: #fff solid 3px; display: block; padding: 5px; width: 100%; } 8. Drag ProductReviews.ascx from Solution Explorer to the bottom of the placeholder in Product.aspx. 9. Load BalloonShop in your browser and click a product to view its product details page. If you re not logged in and the product has no reviews, you ll see the output shown in Figure 21-2. A sample output for a product that has one review was presented in Figure 21-1.

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Because a web service is supposed to serve cross-platform environments, it relies heavily on XML HTTP, XML, and SOAP form the pillars of web services architecture Web services are industry standards and just like XML they are standardized by the W3C and hence have massive industry support Have a look at Figure 1-8 again Assume that the three machines involved are connected via the Internet and not a LAN The components will now be replaced with web services and they will perform the same job as the components did previously In such cases, the client will call a web service residing on the business logic server, which in turn calls a web service residing on the database server The requested data is sent back to the client in XML format It doesn t matter whether the client is a VB6 application, a VBNET application, or a Java application.

The ProductReviews.ascx control is made up of three important controls: A DataList control that displays the existing product reviews. A Panel control that contains the controls necessary to create a new customer review. A LoginView control that displays the following message to unauthenticated users: Please log in to write your own review. The code that makes things work is pretty straightforward and reuses the concepts you ve already met earlier in this book.

public or add them to Google s image search (Blogger or Picasa Web Albums).


Powerful, isn t it You will explore web services thoroughly in later chapters..

Yep, it was that simple. Although you might want to add improvements for your own solution (for example, allow the visitors to edit their reviews, or forbid them from adding more reviews), the base is there, and it works as expected. You re now all set to proceed to the final chapter of this book, where you ll learn how to sell items to your customer from an outside source (we ve chosen by using XML Web Services. qr code reader free

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