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13: Enumerated Types and Bit Flags............................................................................240 Enumerated Types ...............................................................................................................240 Bit Flags...............................................................................................................................244 14: Arrays .........................................................................................................................247 Overview..............................................................................................................................247 All Arrays Are Implicitly Derived from System.Array............................................................249 Casting Arrays.....................................................................................................................251 Passing and Returning Arrays.............................................................................................252 Creating Arrays That Have a Nonzero Lower Bound ...........................................................253 Fast Array Access................................................................................................................254 Redimensioning an Array .....................................................................................................257 15: Interfaces...................................................................................................................259 Interfaces and Inheritance...................................................................................................259 Designing an Application That Supports Plug In Components...........................................263 Changing Fields in a Boxed Value Type Using Interfaces...................................................264 Implementing Multiple Interfaces That Have the Same Method..........................................266 Explicit Interface Member Implementations.........................................................................268 16: Custom Attributes .....................................................................................................273 Using Custom Attributes......................................................................................................273 Defining Your Own Attribute................................................................................................276 Attribute Constructor and Field/Property Data Types..........................................................278 Detecting the Use of a Custom Attribute ..............................................................................279 Matching Two Attribute Instances Against Each Other .......................................................283 . Pseudo Custom Attributes..................................................................................................285 17: Delegates...................................................................................................................287 A First Look at Delegates .....................................................................................................287 Using Delegates to Call Back Static Methods ......................................................................289 Using Delegates to Call Back Instance Methods.................................................................290 Demystifying Delegates.......................................................................................................291 Some Delegate History: System.Delegate and System.MulticastDelegate.........................294 Comparing Delegates for Equality.......................................................................................296 Delegate Chains..................................................................................................................296 C# s Support for Delegate Chains.......................................................................................300 Having More Control over Invoking a Delegate Chain.........................................................301 Delegates and Reflection.....................................................................................................303 Part V: Managing Types................................................................................................................306 List.........................................................................................................................306 . 18: Exceptions .................................................................................................................307 Overview..............................................................................................................................307 The Evolution of Exception Handling...................................................................................307 The Mechanics of Exception Handling .................................................................................309 The try Block..................................................................................................................310 The catch Block ..............................................................................................................310 The finally Block.............................................................................................................312 iv

The first time you run this code, you can expect to see the warning dialog shown in Figure 13-9 (unless you ve disabled your Windows Firewall) By default, the Windows Firewall will notify you when programs start listening for incoming network connections out of the blue Typically, a program that has a legitimate need to accept connections will register itself with the firewall when it s installed, so when a program that the firewall knows nothing about suddenly starts listening for incoming connections, that s likely to be a sign of trouble it s exactly the sort of thing that malware would do if it wanted to make your machine available to hackers for distributing spam or launching distributed denial of service attacks.

Your first foray onto the network might be somewhat less than fully satisfying, as you ll encounter some obstacles:

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Of course, in this case, you know that the code is legitimate because you just wrote it, and the reason your program hasn t gone through the official route of registering itself during installation is that you only just wrote the code, and you haven t written the Windows Installer msi yet So as a developer, you expect to see this sort of warning for your own programs when they listen for incoming connections (You didn t see this for the WCF example earlier because it was using the specially reserved design-time address space that Visual Studio sets up when you install it But that works only for HTTP there s no equivalent for sockets) You just need to click Unblock, and you shouldn t see this warning again for this particular program To test this program, you can use the client program you wrote earlier.

If you use Microsoft Dynamics CRM Online, you don t have to worry about any of the server requirements detailed in this section because Microsoft includes everything you need as part of the monthly hosting fee. However, if you choose to deploy Microsoft Dynamics CRM on-premises or as partner-hosted software, you need to consider the design of your server environment. You have great flexibility in designing and configuring your Microsoft Dynamics CRM environment, and your final system design will depend on several variables, such as:

The simplest approach will be to run two copies of Visual Studio, one for the client and one for the server (Or you could configure Visual Studio to run both projects, as we did earlier) Run the server first Then go to the client, modify the line that specifies the machine name replace time-nwnistgov with localhost and then run the client It should print out the current time and date The format will be different from the one used by the NIST server it ll be the default used by the DateTime type But that s fine, because the Daytime Protocol specification says we re free to use any format we like as long as it s ASCII and it fits on a single line And that s it for basic socket use.

This property returns the configured cookie name used for the This property returns the configured cookie path used for the

Sockets also support asynchronous versions of all the methods in fact, they support both the event-based and the method-based asynchronous styles we encountered earlier Since you ve already seen this kind of code in action,.

the type of the object referred to. When compiling your source code, the compiler knows whether or not you re calling a virtual method and emits the proper call or callvirt IL instruction. This means that it s possible to call a virtual method nonvirtually, an approach that is commonly used when your code calls a virtual method defined in your type s base class, as shown here:

Table 6.1 Ways to specify packages to include. The final option, packagelist is not usually used; it exists to make it easier to migrate from Ant. Attribute/element Specification packagenames <package> packagelist Example

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