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A business object taps into this functionality through methods exposed on BusinessBase. The end result is that a business property is always coded in a consistent manner. In the following example, the highlighted line of code triggers the validation rules behavior: public string Name { get { if (CanReadProperty()) return _name; else throw new System.Security.SecurityException("Property get not allowed"); } set { if (CanWriteProperty()) { if (value == null) value = string.Empty; if (_name != value) { _name = value; PropertyHasChanged(); } else throw new System.Security.SecurityException("Property set not allowed"); } } } You ll see more complete use of the validation rules functionality in 8, during the implementation of the sample application. There are three types of functionality displayed in Figure 2-13. The ValidationRules, RuleHandler, RuleArgs, and ValidationException classes manage the rule methods associated with the properties of an object. The BrokenRulesCollection and BrokenRule classes maintain a list of currently broken validation rules for an object. Finally, the CommonRules class implements a set of commonly used validation rules, such as StringRequired.

s Note Although we will be using C# to interface with the ReportViewer control, RDL files only support

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That is, you retrieve the data by some key and need that data ordered by some other column. Using a sorted hash cluster, Oracle can return the data without performing a sort at all. It accomplishes this by storing the data upon insert in sorted order physically by key. Suppose you have a customer order table: ops$tkyte@ORA11GR2> select cust_id, order_dt, order_number 2 from cust_orders 3 order by cust_id, order_dt; CUST_ID ORDER_DT ORDER_NUMBER ------- ---------------------------- -----------1 31-MAR-05 09.13.57.000000 PM 21453 11-APR-05 08.30.45.000000 AM 21454 28-APR-05 06.21.09.000000 AM 21455 2 08-APR-05 03.42.45.000000 AM 21456 19-APR-05 08.59.33.000000 AM 21457 27-APR-05 06.35.34.000000 AM 21458 30-APR-05 01.47.34.000000 AM 21459 7 rows selected. The table is stored in a sorted hash cluster, whereby the HASH key is CUST_ID and the field to sort on is ORDER_DT. Graphically, it might look like Figure 10-10, where 1, 2, 3, 4, represent the records stored sorted on each block.

public class SoundRecordingDemo extends Activity { MediaRecorder mRecorder; File mSampleFile = null; static final String SAMPLE_PREFIX = "recording"; static final String SAMPLE_EXTENSION = ".mp3"; private static final String TAG="SoundRecordingDemo"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); this.mRecorder = new MediaRecorder(); Button startRecording = (Button)findViewById(R.id.startrecording);

don t fall into the trap of adding too much functionality to an existing type via this route. Instead, it s often simpler to use additional modules and types. For example, the module Microsoft.FSharp.Collections.List contains extra functionality associated with the F# list type.

The following code shows an example of a void method with a return statement. The method writes out a message only if the time is after noon. The process, which is illustrated in Figure 5-5, is as follows: First the method gets the current date and time. (Don t worry about understanding the details of this right now.) If the hour is less than 12 (that is, before noon), the return statement is executed, and control immediately returns to the calling method without writing anything to the screen. If the hour is 12 or greater, the return statement is skipped, and the code executes the WriteLine statement, which writes an informative message to the screen.

If you had a service running on Update Role A Role B Role C Azure, you might need six role Domain 1 Instance 1 Instance 3 Instance 2 instances to handle the demand on Update Role A Role B Role C your service, but you should request Domain 2 Instance 2 Instance 1 Instance 3 nine instances instead You request Update Role A Role B Role C more than you need because you Domain 3 Instance 3 Instance 2 Instance 1 want a high degree of tolerance in Fault Fault Fault your architecture As shown in figDomain 1 Domain 2 Domain 3 ure 38, you would have three fault Figure 38 Fault and update domains help increase domains and three update domains fault tolerance in your cloud service This figure shows defined If there s a fault, only a three instances of each of three roles.

You will now create an example to demonstrate two-way data binding. 1. 2. Open DataBindingTest.xaml. Add the following XAML after the cmdChangeTitle button (note that the binding mode is set to TwoWay now): <TextBlock>Two way binding:</TextBlock> <TextBox x:Name="txtTwoWay" Width="300" Text="{Binding Title, Mode=TwoWay}" Height="20" > </TextBox> 3. Open DataBindingTest.xaml.cs. In DataBindingTest_Loaded()()add the following code (after the call to PopulateItems()) to bind the text box txtTwoWay to the first item in the movie list: //Set up two way binding txtTwoWay.DataContext = MoviesList[0]; 4. 5. 6. 7. Press F5 to run your application. Click the DataBinding button and select the text box labelled txtTwoWay. Change the text to The Terminator 2 . Click another text box.

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