ASP.NET PDF Viewer using C#, VB/NET

The full .NET Framework is designed to work with a wide range of databases. The simple ADO.NET data access we started with uses interfaces to allow database vendors to supply their own database-specific implementations. Likewise, the Entity Framework is database-agnostic it has an open provider model designed to allow support for any relational database to be added. Of course, Microsoft ships a provider for its own database, SQL Server, but other suppliers offer providers for various databases, including Oracle, MySQL, PostgreSQL, SQLite, Sybase, and DB2. In this book, we will use SQL Server. The examples work with SQL Server, which is available for free. (Some editions of Visual Studio will automatically install SQL Server 2008 Express for you by default.) The Express edition of SQL Server is the same database engine as the real versions, but with some limits on database size and with some of the more advanced features missing. Despite being a trimmed down version, it s easily capable of supporting substantial websites. It can also be used on client applications written with WPF or Windows Forms, to support client-side data stores or caching, although it can complicate the installation process for such an application installing a SQL Server instance is not a trivial task.

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When the project file has been updated with one or more translations, it is time to identify the strings that need to be translated by extracting them from the various tr() calls found throughout the application. There are other cases, too, but they will be discussed later. The lupdate tool is used to extract the phrases it creates or updates all ts files listed in a given project file. It is nice to know that when it updates an existing file it does not remove anything all the translations already done are kept intact. Because the project file is called sdi.pro, the command to enter at the command line is lupdate sdi.pro. This will create the sdi_sv_SE.ts file from the strings found in the sources in the project file. Although Qt comes with a tool for software translators, not all translation businesses want to use custom tools. Fortunately, the ts files are quite easy to process because they are formatted as XML. Listing 10-1 shows an extract of the untranslated sdi_sv_SE.ts file. Listing 10-1. An example of the contents of an untranslated ts file < xml version="1.0" encoding="utf-8" > <!DOCTYPE TS><TS version="1.1"> <context> <name>SdiWindow</name> <message> <location filename="sdiwindow.cpp" line="254"/> <source>%1[*] - %2</source> <translation type="unfinished"></translation> </message> <message> <location filename="sdiwindow.cpp" line="19"/> ... </context> </TS> As you can see from the extraction, it shouldn t be hard to convert it into the format that your translation company prefers and back again.

If you want to follow the examples in this chapter, not only will you need a copy of SQL Server 2008 Express installed, but you ll also need to install a sample database. We ll be using the lightweight version of the Adventure Works database available from http://msftdbprodsamples.codeplex.com/. Getting this sample up and running is slightly fiddly, because there are numerous different versions of the Adventure Works sample there are full and lightweight versions for both SQL Server 2005 and SQL Server 2008, and each version of SQL Server comes in various editions, not all of which put their datafiles in the same place. Because of all the variations, it s quite easy to find that the sample database has failed to appear even though the installation appeared to proceed without error. Moreover, the steps required to install the database change from time to time, as new versions are released. We had been planning to provide detailed steps here, but while

we were writing this book, changes to the database installer rendered the first set of instructions we had produced useless. Since that could well happen again between us finishing the book and you reading it, we re providing the instructions as part of the sample code you can download for this book from the O Reilly website so that we can update them when necessary. You can find these at http://oreilly.com/catalog/ 9780596159832/. Now that we ve finished a quick survey of the data access features available in .NET and we ve seen how to get the sample database installed, let s look at the Entity Framework in more detail. We ll start with the model at the heart of the framework.

The main goal of the Entity Framework (or EF for short) is to make it easier for your code to work with data in the database. C# objects are quite different in nature than the information stored in a relational database, and the process of managing these differences, and transferring data between these two worlds, is called mapping. (So the Entity Framework is a kind of ORM.) As Figure 14-1 illustrates, mapping happens in both directions. As information is fetched from the database, it is loaded into objects. And if your C# code modifies these objects or creates new ones, you can arrange for the database to be correspondingly updated.

<script language="JavaScript"> var g_panel; function pageLoad() { // Set up the atlas panel and set up the initial css g_panel = new Sys.UI.Control($('panel')); g_panel.initialize(); g_panel.set_cssClass('normal'); var btnVisibility = new Sys.UI.Button($('Button1')); btnVisibility.initialize(); btnVisibility.click.add(onSetVisibilityClick); } function onSetVisibilityClick() { g_panel.set_visible(!g_panel.get_visible()); } </script>