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The classes I used in the previous examples had relatively short names, but namespaces can be nested very deeply, resulting in some very fully qualified names. For example, there is a class called BinaryFormatter in the System.Runtime.Serialization.Formatters.Binary namespace. Listing 11-2 demonstrates defining a variable of this type. Listing 11-2. Using a Class with a Long Namespace Identifier class MyClass { static void Main(string[] args) { // define a variable using a type with a long namespace System.Runtime.Serialization.Formatters.Binary.BinaryFormatter binaryFormatter; // print out a simple message System.Console.WriteLine("Hello World!"); // wait for input before exiting System.Console.WriteLine("Press enter to finish"); System.Console.ReadLine(); } } You can see that referring to this class becomes unwieldy. To make things easier, C# has the using keyword, which lets you import a namespace, allowing you to refer to the classes in that namespace without having to use their fully qualified names. Listing 11-3 demonstrates the using keyword. Listing 11-3. The using keyword using System; using System.Runtime.Serialization.Formatters.Binary;

The Return Statement and Void Methods .............................................................................................78

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set { CanWriteProperty("Name", true); if (string.IsNullOrEmpty(value)) value = string.Empty; if (_name != value) { _name = value; PropertyHasChanged("Name"); } } } Obviously the helper methods discussed earlier in the chapter result in a lot less code and are the preferred approach for coding properties. The CanReadProperty() and CanWriteProperty() methods check the current user s roles against the list of roles allowed and denied read and write access to this particular property. If the authorization rules are violated, a security exception is thrown; otherwise, the user is allowed to read or write the property. The CanReadProperty() and CanWriteProperty() methods are public in scope. This is important because it allows code in the UI layer to ask the object about the user s permissions to read and write each property. The UI can use this information to alter its display to give the user visual cues as appropriate. In 19, you ll see how this capability can be exploited by a custom WPF control to eliminate most authorization code in a typical application. While the story isn t quite as compelling in Web Forms, 20 demonstrates how to leverage this capability in a similar manner.

14-11, 14-12

Click the Browse button, and select the Northwind.mdf file from the location to which you copied it. In my case, I copied the database files to the C:\Northwind directory. Click OK when you have selected the file; there is no need to change the other settings on this screen. Now that we have created a new database connection, we return to the Choose Your Data Connection screen, as shown by Figure 30-6, which has been populated with the details we need. Ensure that the Save entity connection settings check box is checked. This will store the details of our connection in our project, which will make things easier for us to change if we want to connect to a different database, for example, a test or production system. Click the Next button.

Entity Data Model (EDM)

Post-cache substitution is a handy feature that is designed for performance optimization. It dovetails with output caching. The functionality is exposed via a web control named Substitution, but you can think of this feature as a modification to the output caching infrastructure present in version 1.x of ASP .NET.

query will still be making repeated executions of the subquery I want to find a way to avoid the repeated executions Also notice that the subquery is against the same table I m accessing in the outer query So the primary question I d want to consider is Can I write this query differently to avoid multiple accesses against the same table over and over Right now, the way the query is written, there s not much that can be done to make it scale very well It may perform okay now, but what about when the volume of data grows Listing 7-14 shows what happens if I double the table size to 50 rows Listing 7-14.

Console.WriteLine("Hello, World!");

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