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The class is now sealed (although it doesn t have to be) . In fact, the class could be a static class or even a value type . The tool-produced code and the developer-produced code are really two partial definitions that ultimately make up one type definition . For more information about partial types, see the Partial Classes, Structures, and Interfaces section in 6, Type and Member Basics . The tool-produced code defined a partial method declaration . This method is marked with the partial token and it has no body . The developer-produced code implemented the partial method declaration . This method is also marked with the partial token and it has a body .

Here are several techniques for achieving good coding practices that are less heavy-handed than laying down rigid coding standards:

Note For simplicity, you are dividing by 1000 instead of 1024.Therefore, the calculation will not be exact, but close enough for the purposes ofthis example.

The TreeView control can be populated by using static data or by using data binding. To populate the TreeView control with static data, you can use declarative syntax by placing opening and closing <Nodes> tags in the TreeView element and then creating a structure of nested <TreeNode> elements within the <Nodes> element. Each <TreeNode> has properties that you can set by adding attributes to the <TreeNode> element. To use data binding to populate the TreeView control, you can use any data source that implements the IHierarchicalDataSource interface, such as an XmlDataSource control or a SiteMapDataSource control. Simply set the DataSourceID property of the TreeView control to the ID value of the data source control, and the TreeView control automatically binds to the specified data source control. You can also bind to an XmlDocument object or a DataSet object that contains DataRelation objects by setting the DataSource property of the TreeView control to the data source and then calling the DataBind method. The TreeView control contains a DataBindings property that is a collection of TreeNodeBinding objects that define the binding between a data item and the TreeNode. You can specify the binding criteria and the data item property to display in the node. This is useful when binding to XML elements when you are interested in binding to an attribute of the element. Assume that you want to use a TreeView control to display customer data from a file called Customers.xml, which contains a list of customers, their orders and invoices, and the items for each order. This data is stored in a hierarchical format in the XML file. The Customers.xml file looks like the following.

1. 2.

they re called Important.) Here you ll nd security notes, cautions, and warnings to keep you and your network out of trouble.

4. Set the diagnostic value to log all events (the default is 0 or no logging) using this command:

A surprising number of programs use the Win32 Debugging API These include the Visual Studio NET debugger when debugging native code, which I cover in depth in 5 and 7; the Windows Debugger (WinDBG), which I discuss in 8; Compuware NuMega's BoundsChecker; the Platform SDK Depends program (which you can install as part of Visual Studio NET); the Borland Delphi and C++ Builder debuggers; and the NT Symbolic Debugger (NTSD) I'm sure there are many more Common Debugging Question: How can I protect my Win32 program from being debugged One of the most common requests I get from developers working on vertical market applications with proprietary algorithms is how can they protect those algorithms and keep their competitors from taking a peek at them with a debugger.

C-35 C-39

6

Although you can call IsDebuggerPresent, which tells you whether a user-mode debugger is running, if someone has half a brain, the first thing she'll do when reverse engineering is patch IsDebuggerPresent to return 0 so that it appears as though no debugger is running Although there's no perfect way to protect against a very determined hacker who has physical access to your binaries, you can at least make life a little more different for him at run time Interestingly enough, the check that IsDebuggerPresent does to see whether a debugger is running on the process has been the same check in all Microsoft operating systems up to the time of this writing There's no guarantee that it won't change, but the odds are good that it will stay the same for the future.

Table F-3.