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The view model can indicate a change in the command s CanExecute status by calling the RaiseCanExecuteChanged method on the DelegateCommand object. This causes the CanExecuteChanged event to be raised. Any controls in the UI that are bound to the command will update their enabled status to reflect the availability of the bound command. Other implementations of the ICommand interface are available. The ActionCommand class provided by the Expression Blend SDK is similar to Prism s DelegateCommand class described earlier, but it supports only a single Execute method delegate. Prism also provides the CompositeCommand class, which allows DelegateCommands to be grouped together for execution. For more information about using the Composite Command class, see Composite Commands in 6, Advanced MVVM Scenarios. Invoking Command Objects from the View There are a number of ways in which a control in the view can be associated with a command object proffered by the view model. Certain WPF and Silverlight 4 controls, notably ButtonBase derived controls, such as Button or RadioButton, and Hyperlink, or MenuItem derived controls, can be easily data bound to a command object through the Command property, as shown in the following example. WPF also supports binding a view model ICommand to a KeyGesture.

Add code to the Page_Init method of the user control. Here you test for the ITemplate property. If the ITemplate property is set, you create an instance of the naming container class and create an instance of the template in the naming container. You then add the naming container instance to the Controls collection of the PlaceHolder server control. You might also need to pass data from your user control to the naming container. This allows users to set properties of your user control, and store and use them in the container. For these situations, you must define this data in your user control as properties that a developer who is using your user control can set. You then must pass a reference to this data to the naming container. This ensures that the naming container is updated when the property values change on the user control.

// Error: conflicts with AType<T1, T2> internal sealed class AType<T3, T4> {} internal sealed class AnotherType { // It is OK to define the following methods: private static void M() {} private static void M<T>() {} private static void M<T1, T2>() {} // Error: conflicts with M<T> that has no constraints private static void M<T>() where T : IComparable<T> {} // Error: conflicts with M<T1, T2> private static void M<T3, T4>() {} }

Figure 12-19

Assigning an appropriate account type to the people who use your computer is straightforward. At least one user must be an administrator; naturally, that should be the person who administers the computer. All other regular users should each have a standard user account. Use a guest account if you have guests or occasional users; that way, they can use your computer without gaining access to your files. Groups allow a system administrator to create classes of users who share common privileges. For example, if everyone in the accounting department needs access to the Payables folder, the administrator can create a group called Accounting and grant the entire group access to that folder. If the administrator then adds all user accounts belonging to employees in the accounting department to the Accounting group, these users will automatically have access to the Payables folder. A user account can belong to one group, more than one group, or no group at all. On a computer that is shared by many users, groups can be a valuable administrative tool. They simplify the job of ensuring that all members with common access needs have an identical set of privileges. Although you can grant privileges to each user ac-

Figure 29-10 In risk-oriented integration, you integrate classes that you expect to be most troublesome first; you implement easier classes later.

11 . . Add a PropertyGridEditorPart to the EditorZone on the page . Just pick one out of the Toolbox and drop it onto the EditorZone, as shown in the following graphic:

In this practice, you analyze traffic for both a DHCP lease initialization and a DHCP lease renewal.

support record insertions by modifying the footer or the pager to make room for empty text boxes and buttons. The GridView supports the same model and makes it slightly simpler through the PagerTemplate property. This property, in fact, lets you define a custom template for the pager bar where you can subsequently arrange any combination of controls.

Depending on your circumstances, you would need to precompute the loanDivisor array at program initialization time or read it from a disk file. Alternatively, you could initialize it to 0, compute each element the first time it s requested, store it, and look it up each time it s requested subsequently. That would be a form of caching, discussed earlier. You don t have to create a table to take advantage of the performance gains you can achieve by precomputing an expression. Code similar to the code in the previous examples raises the possibility of a different kind of precomputation. Suppose you have code that computes payments for many loan amounts, as shown here.