c# code 39 barcode generator AP P END I X A CREA TI NG C UST O M X MLREA D ER AN D XM LWRI T ER C LA SS ES in C#

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AP P END I X A CREA TI NG C UST O M X MLREA D ER AN D XM LWRI T ER C LA SS ES
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Then, one by one, RSS tags are emitted so as to output an RSS feed, as shown in Listing A-5 earlier. Notice how the RssElements enumeration has made our job easy. Various methods such as WriteElementString() and WriteStartElement() make extensive use of the RssElements enumeration. After the writing of the feed is over, the RssWriter instance is closed. Finally, the End() method of the Response object is called so that the response stream is flushed off to the client.
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Note For the sake of simplicity, the code emits hard-coded values. In most real-world cases, you will
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retrieve data such as the title, URL, and publication date from a database table.
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If you run the web form after writing the code, it should look similar to Figure A-3.
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Figure A-3. RSS feed displayed in the browser
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Summary
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In this appendix, you learned to create custom implementations of the XmlReader and XmlWriter classes. The XmlReader and XmlWriter classes are abstract classes. To create custom readers and writers, you need to inherit from them and override various properties and methods. This way, you can easily extend the out-of-the-box functionality exposed by these classes for a specific scenario.
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APPENDIX
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Case Study: A Web Service Driven Shopping Cart
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n 9, you learned about web services. In the sections to follow, you are going to learn how web services can be put to use in a real-world scenario. As an example, we are going to develop a shopping cart driven entirely by web services. The business scenario under consideration is as follows: Acme Inc. is a company marketing and selling electric and electronic items. As an aggressive marketing strategy, they wish to tie up with various leading websites to increase their sales and reach. To attract website owners, Acme launches an affiliate program through which website owners can sell Acme products on their respective websites. The websites will not ship or distribute any products themselves. They will simply grab orders from their visitors and then submit the orders to Acme for fulfillment. In return, the websites will earn a commission on each order. Acme wants to develop a web service based solution that is easy to implement, cross-platform, and industry accepted. Considering this scenario, we can define the requirements of the solution as follows: The solution must be platform independent. The individual websites will not maintain a product database themselves. Acme will expose the functionality of the shopping cart (addition, modification, and removal of products from the cart) in the form of a web service. Acme will expose their product database via a web service so that individual websites can display product catalogs on their respective sites. When the visitors of individual websites place an order, the data is saved directly into the Acme database.
Creating the Database
To begin, you need to create a SQL Server database. You can do so with the help of Server Explorer. Open Server Explorer by choosing View Server Explorer from the menu. Then right-click on the Data Connection node of Server Explorer and choose Create New SQL Server Database. Clicking this option will pop up the dialog box shown in Figure B-1.
APPENDIX B C AS E STUDY: A WEB S ERVICE DRIV EN S HOPPIN G CA RT
Figure B-1. Creating a new database by using Server Explorer The dialog box essentially allows you to specify a database server, authentication mode, and database name. Name the database Database.
Note You can also create the database via a CREATE DATABASE T-SQL statement. To do so, you can open a query window of SQL Server Management Studio by clicking the New Query toolbar button and then executing a CREATE DATABASE database statement. This will create a new database named Database with default settings.
After you create the database, you need to create four tables in it: Products, ShoppingCart, Orders, and OrderDetails. The structure of these tables should match the details shown in Table B-1. Table B-1. Table Structures
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