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A great feature introduced by BD-Live is called Progressive PlayList The intent is to allow AV streams delivered from the network to start playing before the entire stream is downloaded A user does not have to wait until the entire stream is downloaded before it can be watched The playback can begin as soon as a minimum amount of data is transferred into a local buffer, while the rest of the stream continues to download in the background This kind of functionality is very common to Internet downloads that provide pseudo-streaming experiences using progressive downloads In Blu-ray, this is implemented by using a virtual asset (a Progressive PlayList) that is similar in structure to a regular PlayList in the sense that it contains multiple PlayItems and references AV stream data However, it differs in the way that it allows playback to start before all assets are available Because a PlayList is divided into multiple PlayItems, the playback can start once the first PlayItem is successfully downloaded While the playback starts, the remaining Playitems continue downloading in the background As additional PlayItems become available, they are enabled for playback It only depends on the download speed to determine whether or not the playback will be seamless If the download speed is too slow, the playback will pause at the end of a PlayItem until the next item is available, at which point the playback continues

The operator pair += tells the compiler to assign the value of x plus 10 to x This type of assignment is formally called a compound assignment This shorthand works for all binary operators (those that require two operands) The general form of the shorthand var = var operator expression; is the same as var operator = expression;

Note: This code uses the Version class to decode the version string. The constructor of this class accepts a string and provides access to the individual parts of the corresponding version number.

Here is another example,

In your applications, you can set the build and revision numbers explicitly, or have .NET generate them automatically. We will change the version number repeatedly throughout this book as a way to indicate which section of the book corresponds to the current application. You can change or not change the version number as you wish. On the book s web site, these version numbers are used to identify the file associated with a specific section. In your own applications, a version number identifies a specific instance of a product that your customers or friends are using. This is useful for documentation and support reasons, and for indicating to your customers when new features and functionality are added to a product. Note that it is common practice to include the version number in a dialog box, often called an About box, that is available from a top-level Help menu in an application. Of course, the class Form1 is not the most descriptive name, so let s rename this class next. 2.2.2 Renaming a form One other change before we add some controls to our form. Visual Studio created the class Form1 in our project. Let s rename this file and associated class to MainForm.

6-47

x = x - 100;

RENAME THE FORM1 CLASS AND FILE TO MAINFORM Action 1 Rename the Form1.cs file in the Solution Explorer window to MainForm.cs.

x -= 100;

3

Result The file is renamed. The designer and code windows are also renamed to reflect the new file name.

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his chapter discusses C/C++ s rich and varied program control statements C and C++ categorize statements into these groups: I Selection I Iteration I Jump I Label I Expression I Block

a. Right-click the Form1.cs file in the Solution Explorer window. b. Select the Rename item. c. Type the new name MainForm.cs for the file. d. Press the Enter key. 2 If not already shown, display the MainForm.cs window containing our source code.

The selection statements are the if and switch The term conditional statement is often used in place of selection statement The iteration statements are while, for, and do/while These are also commonly called loop statements The jump statements are break, continue, goto, and return The label statements include the case and default statements (discussed along with the switch statement) and the label statement itself (discussed with goto) Expression statements are statements composed of a valid expression Block statements are simply blocks of code (A block begins with a { and ends with a }) Block statements are also referred to as compound statements Since many statements rely upon the outcome of some conditional test, let s begin by reviewing the concepts of true and false