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The Page class exposes only a few interesting methods. The HasControls method returns True if the page contains controls, and the DataBind method binds all the child controls to their data source. The MapPath method converts a virtual path into a phys ical path, so it s useful for passing arguments to object methods that don t work with virtual paths:

Dim sr As New System.IO.StreamReader(Me.MapPath( /data/values.dat ))

Here is part of the Update method in the BallSprite class that plays a sound when the cheese ball hits the top of the screen:

You can also use MapPath to retrieve information about the current ASP.NET applica tion, as you see in this snippet:

blue margin guides are approximately centered within the border. The border consists of sets of overlapping rectangles. You can move the entire border because all of its components are grouped to form one object that can be treated as a single unit.

The current directory Dim currDir As String = The parent directory Dim parentDir As String The root directory Dim rootDir As String = (same as TemplateSourceDirectory property) Me.MapPath( . ) = Me.MapPath( .. ) Me.MapPath( / )

The ResolveUrl method converts a relative virtual path into an absolute virtual path, so it s useful for building URLs to be passed to the client (for example, as hyperlinks). Notice that the domain name isn t returned by this function, so you must add it explic itly if necessary:

Provide the complete URL to a file. (Assumes that the domain URL is www.vb2themax.com.) Dim url As String = www.vb2themax.com & Me.ResolveUrl( /data/values.dat )

Part VI:

if (y <= minDisplayY) { // ball has hit the top of the screen. edgeHitSound.Play(); ySpeed = Math.Abs(ySpeed); }

Table 24-1

See Also For information about grouping objects, see Connecting and Grouping Shapes, earlier in this chapter.

(continued)

Description The code page value for the response. You set this attribute only if you re creating a page that uses a code page different from the default code page of the Web server. The locale identifier for this page. The culture setting for this page. It takes the same values as the CultureInfo class. (See the section The Cul tureInfo Auxiliary Class in 7.) The user interface culture setting for this page. If True, the page runs in a singlethreaded apartment (STA) and can use STA components, such as those authored with Visual Basic 6. You also must set it to True for calling COM+ 1.0 components that access the unmanaged ASP objects through the ObjectContext object. (Default is False.) Indicates whether transactions are supported for this page. The value can be Disabled (default), NotSupported, Supported, Required, or RequiresNew. Enables or disables the generation of debug symbols for this page. (Default is False.) Enables or disables tracing for this page. (Default is False.) Determines how trace messages are displayed. The value can be SortByTime (default) or SortByCategory. The name of the class that is compiled automatically the first time the page is requested. The name must not contain spaces. The code-behind class for the page; can be any class derived from the Page class. The language used for inline code enclosed by <% and %> delimiters.

24:

Sample Code: 04 Bread and Cheese with Sound The samp e project n the 04 Bread and Cheese w th Sound d rectory n the resources for th s chapter conta ns a vers on of the game that has a the ex st ng game p ay w th sounds added I have used the code from the mus c p ayer that we created n 7, P ay ng Sounds, to p ay background mus c and to make the sound for the dead y pepper repeats when t s on the screen And you shou d make sure that you have the vo ume turned down a b t before the tanger nes turn up

Table 24-1

(continued)

2