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The Draw method contains a block of statements. C# programs are expressed as a series of statements that are separated by the semicolon (;). Each statement describes a single action that your program needs to do. There are a number of different kinds of statements; you ll discover new ones as you learn more about programming. The statements are organized into a single block. A block is a way to lump statements together. The start of a block is marked with an open curly bracket character ({), and the end of the block is marked with a closing curly bracket (}). These curly kinds of brackets are sometimes called braces. The C# compiler, which is trying to convert the program text into something that the Xbox can actually run, will notice and complain if you use the wrong kind of bracket. In the previous code, there is also a comment. Comments are ignored by the compiler; they let you put text into your program to describe the program or remind you to do things. In the previous code, the comment is a TODO, which tells the programmer they need to do something. In this case, the programmer must add drawing statements at that position in the program file.

Code inside a shared method must abide by special scoping rules. It can access shared members but can t access instance fields, properties, and methods. This is a reasonable limitation in that the code in the shared method wouldn t know which specific object should provide the instance data. (Because shared methods can be invoked before you create an instance of a given class, there might be no running object at all.) When you re creating a class that works as a library of functions, you can use shared functions if you don t want to force the user to create an object just to access those functions. For example, consider the following Triangle class, which exposes functions for evaluating the perimeter and the area of a triangle given its three sides:

Install the Developer Tools (Optional)

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If that time occurs before the interval captured by a log backup, then the point-intime restore fails and no data is rolled forward. If the time occurs after the log backup, then the entire log backup is restored, but the database is not recovered. If the time is within the log backup, then the point-in-time restore succeeds and the database is recovered.

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The capability of caching the output of Web pages adds a lot of power to your programming arsenal, but sometimes caching the entire content of a page is not possible or it s just impractical. Some pages, in fact, are made of pieces with radically different features as far as cacheability is concerned. In these situations, being able to cache portions of a page is an incredible added value. If caching the entire page is impractical, you can always opt for partial caching. Partial caching leverages the concept of ASP.NET user controls that is, small, nested pages that inherit several features of the page. In particular, user controls can be cached individually based on the browser, GET and POST parameters, and the value of a particular set of properties. Let s start with a quick introduction of user controls.

Click Start, and then click Run. In the Run dialog box, shown in the following screen, type the Universal Naming Convention (UNC) path to the printer share, and click OK. That s it. The syntax for UNC paths to printer shares is \\ServerName\PrintShareName, where ServerName is the name or IP address of the print server and PrintShareName is the name of the printer share, such as \\CorpSvr02\ EngMain.

A forwarded record cannot be linked to by multiple forwarding records. If this check fails, error 8972 is reported, as shown here:

Figure 24-6

Just as important, the compiler can flag invalid arguments, so you don t have to trap arguments of invalid type:

completes, the waiting process can acquire the lock. Lock waits are normal, expected, and necessary in multiuser systems.

Your screen looks like this:

<Description( The filename as it appears in the Textbox control )> _ Property Filename() As String Get Return Me.txtFilename.Text End Get Set(ByVal Value As String) Me.txtFilename.Text = Value End Set End Property <Description( The list of file filters ), _ DefaultValue( All files (*.*)|*.* )> _ Property Filter() As String Get Return OpenFileDialog1.Filter End Get Set(ByVal Value As String) OpenFileDialog1.Filter = Value End Set End Property

The method for displaying all the top-level sites on a virtual server is among the most obscure of all. If, and only if, you re a server administrator, proceed as follows.

Notice that memory allocated in this way isn t controlled by garbage collection. If you forget to release it, it will be freed only when the application terminates. When working with COM, you typically use a different allocating technique, based on the CoTaskMemAlloc function. You can deal with this kind of memory via the AllocCoTaskMem, ReAllocCoTaskMem, and FreeCoTaskMem shared methods:

a statement so that the predicate values are passed in as parameters (example: @P1) and not specified directly as literals (for example, "123").

public Game1() { graphics = new GraphicsDeviceManager(this); Content.RootDirectory = "Content"; // Frame rate is 30 fps by default for Windows Phone. TargetElapsedTime = TimeSpan.FromTicks(333333); }

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