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This chapter is all about error handling . But it s not just about that . There are several parts to error handling . First, we ll define what an error actually is . Then, we ll talk about how to discover when your code is experiencing an error and about how to recover from this error . At this point, state becomes an issue because errors tend to come at inopportune times . It is likely that your code will be in the middle of mutating some state when it experiences the error, and your code likely will have to restore some state back to what it was prior to attempting to mutate it . Of course, we ll also talk about how your code can notify its callers that it has detected an error . In my opinion, exception handling is the weakest area of the common language runtime (CLR) and therefore causes many problems for developers writing managed code . Over the years, Microsoft has made some significant improvements to help developers deal with errors, but I believe that there is much more that must be done before we can really have a good, reliable system . I will talk a lot about the various enhancements that have been made when dealing with unhandled exceptions, constrained execution regions, code contracts, runtime wrapped exceptions, uncatchable exceptions, and so on .

Configure a remote access VPN Diagnose and resolve issues related to remote access VPNs Provide secure access between private networks through a router-to-router VPN Troubleshoot router-to-router VPNs Manage devices and ports Manage packet filters Troubleshoot client access to remote access services

Virtual private networks are logical networks that physically span the Internet. With a VPN, private packets are first encrypted and then encapsulated within a public packet addressed to the remote VPN server. This routing information allows the encrypted payload of private data to tunnel through the public network to reach its endpoint. Upon receiving the encapsulated data through a VPN tunnel, the VPN server then removes the public header and decrypts the private payload. Figure 10-27 illustrates this concept.

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When designing a type, you first imagine the various situations in which the type will be used . The type name is usually a noun, such as FileStream or StringBuilder . Then you define the properties, methods, events, and so on for the type . The way you define these members (property data types, method parameters, return values, and so forth) becomes the programmatic interface for your type . These members indicate actions that can be performed by the type itself or on an instance of the type . These action members are usually verbs such as Read, Write, Flush, Append, Insert, Remove, etc . When an action member cannot complete its task, the member should throw an exception . Important An exception is when a member fails to complete the task it is supposed to perform

Data Packet (Encrypted)

Look at the following class definition:

Data Packet (Original)

The key class is named AppSettingsReader and works as a kind of parser for a small fragment of XML code mostly a node or two with a few attributes ASPNET applications store configuration settings in a file named webconfig that is located in the root of the application's virtual folder Windows Forms applications, on the other hand, store their preferences in a file with the same name as the executable plus a config extension for example, myprogramexeconfig The CONFIG file must be available in the same folder as the main executable The schema of the CONFIG file is the same regardless of the application model The contents of a CONFIG file is logically articulated into sections The NET Framework provides a number of predefined sections to accommodate Web and Windows Forms settings, remoting parameters, and ASP.

internal sealed class Account { public static void Transfer(Account from, Account to, Decimal amount) { from -= amount; to += amount; } }

Data Packet (Decrypted)

Figure 10-27

The Transfer method accepts two Account objects and a Decimal value that identifies an amount of money to transfer between accounts . Obviously, the goal of the Transfer method is to subtract money from one account and add money to another . The Transfer method could fail for many reasons: the from or to argument might be null; the from or to argument might not refer to an open account; the from account might have insufficient funds; the to account might have so much money in it that adding more would cause it to overflow; or the amount argument might be 0, negative, or have more than two digits after the decimal place . When the Transfer method is called, its code must check for all of these possibilities, and if any of them are detected, it cannot transfer the money and should notify the caller that it failed by throwing an exception . In fact, notice that the Transfer method s return type is void . This is because the Transfer method has no meaningful value to return; if it returns at all, it was successful . If it fails, it throws a meaningful exception . Object-oriented programming allows developers to be very productive because you get to write code like this:

10-50

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