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Constructors are methods that allow an instance of a type to be initialized to a good state. For code to be verifiable, the common language runtime (CLR) requires that every class (reference type) have at least one constructor defined within it. (This constructor can be private if you want to prevent code outside your class from creating any instances of the class.) When creating an instance of a reference type, memory is allocated for the instance, the object s overhead fields (method table pointer and SyncBlockIndex) are initialized, and the type s instance constructor is called to set the initial state of the object. When constructing a reference type object, the memory allocated for the object is always zeroed out before the type s instance constructor is called. Any fields that the constructor doesn t explicitly overwrite are guaranteed to have a value of 0 or null. By default, many compilers (including C#) define a public, parameterless constructor (often called a default constructor) for reference types when you don t explicitly define your own constructor. For example, the following type has a public, parameterless constructor, allowing any code that can access the type to construct an instance of the type.

By default the build outputs are placed in the directory de ned by the BinariesRoot and BinariesSubDirectory properties, which default to $(SolutionRoot)\..\$(BinariesSubDirectory) and Binaries respectively. The output and publish directories for individual solutions can be overridden by de ning the OutDir or PublishDir property as part of the SolutionToBuild s Properties metadata as shown here:

Figure 27-5 The second Security Warning dialog asks you to decide whether you want to run a program from an untrusted publisher.

Just as a control s appearance is defined by a control template, you can create a data template to define the appearance of a particular data type. Look at the user interface in Figure 20-16 it shows a pair of listboxes, in a typical master/details scenario. The ListBox on the left looks fairly ordinary it lists product categories, showing each one as simple text. You might think this works by fetching the list of categories and then iterating over them with a loop that creates a ListBoxItem for each one. In fact, it s much simpler than that. Example 20-28 shows the Xaml for the ListBox on the left.

The APL in simpler and less error prone. It uses only 3 operands, whereas the Java fragment uses 17. It doesn t have loop variables, array indexes, or control structures to code incorrectly. One point of this example is that you do some programming to solve a problem and some to solve it in a particular language. The language you use to solve a problem substantially affects your solution.

Depending on the application, disconnected data manipulation can provide a more scalable solution than a connection-based approach; however, locking database records while they're in use isn't always feasible. Without locks, database records are subject to change by another application while the disconnected copy is simultaneously being manipulated in the DataSet. To handle these situations, a DataSet supports the use of an optimistic concurrency strategy by maintaining a copy of both the original and updated data; concurrency errors are identified and handled as updates are written to the database.

The plan for this query is shown in Figure 6-13.

Writer.WriteStartElement("xml"); Writer.WriteAttributeString("xmlns", "s", null, "uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882"); Writer.WriteAttributeString("xmlns", "dt", null, "uuid:C2F41010-65B3-11d1-A29F-00AA00C14882"); Writer.WriteAttributeString("xmlns", "rs", null, "urn:schemas-microsoft-com:rowset"); Writer.WriteAttributeString("xmlns", "z", null, "#RowsetSchema"); }

projection 641 quantification 660 referencing component properties 645 registering SQL functions 640 reporting 655 restriction 635 restriction on groups 657 ResultTransformer 675 scalar result 641 selection 633 subselects 659 theta-style joins 652 transitive closure 659 wildcards 636 HSQLDB 41, 62 I idbag 244, 254 identifier property 48, 162, 305 adding to entities 163 identifiers, comparing 653 identity 161, 391 guaranteed scope 393 of detached objects 394 persistence context scope 393 process scope 393 identity scope, extending 803 id-type 319 ilike() 681 immutability, declaring for annotations 182 immutable 173 implicit association join 657 implicit join 645 implicit polymorphism 192 independent lifecycle 260 index column 246 indexes 375 indices() 661 inheritance 192 mixing strategies 207 table per class hierarchy 199 table per concrete class 192 table per concrete class with union 195 table per subclass 203 inheritance type JOINED 206 SINGLE_TABLE 201 TABLE_PER_CLASS 197

The ReliabilityContractAttribute looks like this:

Exam Tip Expect to be tested on application directory partition concepts and commands, as well as the options in the Change Zone Replication Scope dialog box.

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