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Data binding expressions are always wrapped in the <%# and %> characters. ASP .NET 2.0 also adds support for different types of expressions, commonly known as $ expressions because they incorporate the $ character. Technically, a $ expression is a code sequence that you can add to an .aspx page and that will be evaluated by an expression builder when the page is rendered. The expression builder processes the expression and replaces it with a string value in the final HTML. Currently, ASP.NET includes a built-in expression builder that allows you to extract custom application settings and connection string information from the web.config file. For example, if you want to retrieve an application setting named appName from the <appSettings> portion of the web.config file, you can use the following expression: <asp:Literal Runat="server" Text="<%$ AppSettings:appName %>" /> Several differences exist between $ expressions and data binding expressions: Data binding expressions start with the <%# character sequence, and $ expressions use <%$. Unlike data binding expressions, you don t need to call the DataBind() method to evaluate $ expressions. Instead, they re always evaluated when the page is rendered.

Note To avoid ambiguity, optional parameters must always be packed onto the end of a method signature. It is a compiler error to have optional parameters listed before non-optional parameters.

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Unlike data binding expressions, $ expressions can t be inserted anywhere in a page. Instead, you need to wrap them in a control tag and use the expression result to set a control property. That means if you just want to show the result of an expression as ordinary text, you need to wrap it in a Literal tag (as shown in the previous example). The Literal control outputs its text to plain, unformatted HTML. The first part of a $ expression indicates the name of the expression builder. For example, the AppSettings:appName expression works because a dedicated AppSettingsExpression builder is registered to handle all expressions that begin with AppSettings. Similarly, ASP.NET includes a ResourceExpressionBuilder for inserting resources (see 17) and a ConnectionStringExpressionBuilder that retrieves connection information from the <connectionStrings> section of the web.config file. Here s an example that uses the ConnectionStringExpressionBuilder: <asp:Literal Runat="server" Text="<%$ ConnectionStrings:Northwind %>" /> Displaying a connection string isn t that useful. But this technique becomes much more useful when you combine it with the SqlDataSource control you ll examine later in this chapter, in which case you can use it to quickly supply a connection string from the web.config file: <asp:SqlDataSource ConnectionString="<%$ ConnectionStrings:Northwind %>" ... /> Technically, $ expressions don t involve data binding. But they work in a similar way and have a similar syntax.

Another new language feature added to C# with the release of .NET 4.0 is support for named arguments. To be honest, at first glance, this language construct may appear to do little more than result in confusing code. And to continue being completely honest, this could be the case! Much like optional arguments, including support for named parameters are largely motivated by the desire to simplify the process of working with the COM interoperability layer (again, see 18). Named arguments allow you to invoke a method by specifying parameter values in any order you choose. Thus, rather than passing parameters solely by position (as you will do in most cases), you can choose to specify each argument by name using a colon operator. To illustrate the use of named arguments, assume we have added the following method to the Program class: static void DisplayFancyMessage(ConsoleColor textColor, ConsoleColor backgroundColor, string message) { // Store old colors to restore once message is printed. ConsoleColor oldTextColor = Console.ForegroundColor; ConsoleColor oldbackgroundColor = Console.BackgroundColor; // Set new colors and print message. Console.ForegroundColor = textColor; Console.BackgroundColor = backgroundColor; Console.WriteLine(message); // Restore previous colors. Console.ForegroundColor = oldTextColor; Console.BackgroundColor = oldbackgroundColor; } Now, the way DisplayFancyMessage() was written, you would expect the caller to invoke this method by passing two ConsoleColor variables followed by a string type. However, using named arguments, the following calls are completely fine: static void Main(string[] args) { Console.WriteLine("***** Fun with Methods *****"); ... DisplayFancyMessage(message: "Wow! Very Fancy indeed!", textColor: ConsoleColor.DarkRed, backgroundColor: ConsoleColor.White); DisplayFancyMessage(backgroundColor: ConsoleColor.Green, message: "Testing...", textColor: ConsoleColor.DarkBlue); Console.ReadLine(); }

// Triggers the PreInit event again. Server.Transfer(Request.FilePath); } protected void Page_PreInit(object sender, System.EventArgs e) { try { Theme = Session["UserTheme"].ToString(); } catch { Theme = ""; } } } Notice that we are storing the selected theme within a session variable (see 33 for details) named UserTheme, which is formally assigned within the Page_PreInit() event handler. Also note that when the user clicks a given Button, we programmatically force the PreInit event to fire by calling Server.Transfer() and requesting the current page once again. If you were to run this page, you would now find that you can establish your theme via various Button clicks.

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