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<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="3.5" DefaultTargets="Build"> <PropertyGroup> <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>

In fact, as mentioned earlier in this chapter, when casting a value type instance to an interface type, the CLR must box the value type instance . Because of this fact, two boxings will occur in the previous Main method . EIMIs are frequently used when implementing interfaces such as IConvertible, ICollection, IList, and IDictionary . They let you create type-safe versions of these interfaces methods, and they enable you to reduce boxing operations for value types .

Excluding All-0s and All-1s Host IDs The value 2x yields the total number of distinct bit value combinations for a binary number of x bits, including the combinations of all 0s and all 1s. For example, the value 23 yields 8, which is the number of distinct bit value combinations for 3 bits. The list of these eight possible combinations is as follows:

NOTE: If you find yourself using Qt s graphics scene architecture and need to render Web content, use QGraphicsWebView instead. It inherits from QGraphicsItem and renders correctly in a QGraphicsScene. The QWebView load method takes a QUrl, representing a URL; there are type coercion functions that let you supply a string and it ll be coerced to a URL at runtime, but it s better to be specific instead of relying on compiler magic to say what you mean. QtWebKit s content loading is asynchronous, so it doesn t block the user thread. It signals its progress so that you can notify the user or take other action. It emits the loadStarted signal when the view begins loading, and periodically emits loadProgress whenever a web element of the page (such as an image or JavaScript segment) is fully loaded. When the entire page is loaded, the QWebView emits the loadFinished signal, passing true if the page is successfully loaded, or false if there is a failure. You can control a QWebView s behavior using an instance of QWebSettings, available by calling QWebView::settings. You can change the font family and font size, but the most important things you can adjust are the web attributes that determine how QtWebKit behaves. The attributes include:

The SelectedIndex property lets you get or set the index of the selected item in the ListControl. By using the SelectedItem property, you can access the selected ListItem object s properties. If you only need to access the value of the selected ListItem, use the SelectedValue property. The ListControl also contains the property called AppendDataBoundItems, which can be set to true to keep all items that are currently in the ListControl, in addition to appending the items from the data binding. Setting this property to false clears the Items property prior to binding the data. The ListControl also provides the SelectedIndexChanged event, which is raised when the selection in the list control changes between posts to the server. Recall that you need to set a control s AutoPostback property to true if you intend it to post back to the server for this type of event.

The way that you configure your authorization rules depends on the type of authorization provider you are using. If you use the AzMan provider, you must configure the authorization rules using the AzMan GUI, or through the command line or scripting. If you choose to use the standard authorization rule provider instead, you must configure the authorization rules for this provider. Each rule equates to a task or operation that your users may perform, and for which you want to be able to authorize these users to check if they should be allowed to execute "...that task. Click the "..." button in the Rule Expression property of an Authentication Rule to open the Rule Expression Editor dialog, which..."makes it easier to generate the expressions for each of the rules you define. It helps you to insert the appropriate tokens that indicate individual identities, roles, and anonymous users; plus the operators that allow you to specify compound rules. For example, the following expression identifies users who are members of the Managers role or have the names Alice or Bob, but excludes any managers who are also members of the ITAdmin role: (R:Managers OR I:Alice OR I:Bob) AND NOT R:ITAdmin If you specify this expression for a rule named Update Database, you can use the Authorize method of the Security block to ensure that only users for whom the expression evaluates to true can execute this task. You ll see how in the following sections of this chapter.

4. Which protocols are used to allow Multilink connections to add and drop dial-up lines as needed

Finally, notice that the unsafe two-dimensional array access technique is about as fast as the safe two-dimensional array access technique, but it would be considered the fastest of them all if you also took into account that it accesses a single two-dimensional array (which is one memory allocation), as compared to creating the jagged array (which requires many memory allocations) . Obviously, the unsafe technique has a time and place when it can best be used by your own code, but beware that there are three serious downsides to using this technique:

Figure 12-20

IF IF IF IF IF IF /* IF OBJECT_ID('dbo.GetOrders', 'P') IS NOT NULL DROP PROC dbo.GetOrders; OBJECT_ID('dbo.Orders', 'U') IS NOT NULL DROP TABLE dbo.Orders; OBJECT_ID('dbo.fn_GetOrders', 'IF') IS NOT NULL DROP FUNCTION dbo.fn_GetOrders; OBJECT_ID('dbo.GetOrders0', 'P') IS NOT NULL DROP PROC dbo.GetOrders0; OBJECT_ID('dbo.GetOrders1', 'P') IS NOT NULL DROP PROC dbo.GetOrders1; OBJECT_ID('dbo.GetOrders2', 'P') IS NOT NULL DROP PROC dbo.GetOrders2; ... other procedures ... */ OBJECT_ID('dbo.GetOrders15', 'P') IS NOT NULL DROP PROC dbo.GetOrders15;

Click Run (and click Continue if you get a User Account Control prompt) to start the Connect Computer Wizard at the Choose How To Set Up This Computer page shown in Figure 14-8.

static void Main() { // Construct a reference type object. RefType r1 = new RefType(); // Make another variable point to the reference object. RefType r2 = r1; // Do r1 and r2 point to the same object Console.WriteLine(Object.ReferenceEquals(r1, r2)); // Construct another reference type object. r2 = new RefType(); // Do r1 and r2 point to the same object Console.WriteLine(Object.ReferenceEquals(r1, r2)); // Create an instance of a value type. Int32 x = 5; // Do x and x point to the same object Console.WriteLine(Object.ReferenceEquals(x, x)); // "False" is displayed because x is boxed twice // into two different objects. }