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When you request your web page in a browser, ASP.NET starts by finding the associated code file. Then, it generates a variable declaration for each control you have. For example, imagine you have a text box named txtInput: <asp:TextBox id="txtInput" runat="server"/> ASP.NET generates the following member variable declaration and merges it with your page class using the magic of partial classes: protected System.Web.UI.TextBox txtInput; Of course, you won t see this declaration, because it s part of the automatically generated code that the .NET compiler creates. But you rely on it every time you write a line of code that refers to the txtInput object (either to read or to write a property): txtInput.Text = "Hello."; To make sure this system works, you must keep both the .aspx markup file (with the control tags) and the .cs file (with the source code) synchronized. If you edit control names in one piece using another tool (such as a text editor), you ll break the link, and your code won t compile. Incidentally, you ll notice that control variables are always declared with the protected accessibility keyword. That s because of the way ASP.NET uses inheritance in the web-page model. The following layers are at work:

Here s a connection string that uses this account: string connectionString = "Data Source=localhost;Initial Catalog=Northwind;" + "user id=sa;password=opensesame"; If you re using the OLE DB provider, your connection string will still be similar, with the addition of a provider setting that identifies the OLE DB driver For example, you can use the following connection string to connect to an Oracle database through the MSDAORA OLE DB provider: string connectionString = "Data Source=localhost;Initial Catalog=Sales;" + "user id=sa;password=;Provider=MSDAORA"; And here s an example that connects to an Access database file: string connectionString = "Provider=MicrosoftJetOLEDB40;" + @"Data Source=C:\DataSources\Northwindmdb";.

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In this chapter you tackled two key enhancements that were introduced in ASP.NET 2.0: themes and master pages. Armed with these tools, you can create a complete, integrated web application that has a unified look and feel and a consistent layout. In the next chapter, you ll learn how to add navigation controls to the mix.

1. The Page class from the .NET class library defines the basic functionality that allows a web page to host other controls, render itself to HTML, and provide access to the traditional ASP objects such as Request, Response, and Session. 2. Your code-behind class (for example, HelloWorldPage) inherits from the Page class to acquire the basic set of ASP.NET web-page functionality. 3. When you compile your class, ASP.NET merges some extra code into your class (using the magic of partial classes). This automatically generated code defines all the controls on your page as protected variables so that you can access them in your code. 4. The ASP.NET compiler creates one more class to represents the actual .aspx page. This class inherits from your custom code-behind class (with the extra bit of merged code). To name this class, ASP.NET adds _aspx to the name of the code-behind class (for example, HelloWorldPage_aspx). This class contains the code needed to initialize the page and its controls and spit out the final rendered HTML. It s also the class that ASP.NET instantiates when it receives the page request. Figure 2-22 diagrams this tangled relationship.

Content pages can t use just a portion of the default content or just edit it slightly. This isn t possible because the default content is stored only in the master page, not in the content page. As a result, you need to decide between using the default content as is or replacing it completely.

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