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At its foundation, a computer language is defined by its keywords because they determine the features built into the language C# defines two general types of keywords: reserved and contextual The reserved keywords cannot be used as names for variables, classes, or methods They can be used only as keywords This is why they are called reserved The terms reserved words or reserved identifiers are also sometimes used There are currently 77 reserved keywords defined by version 40 of the C# language They are shown in Table 2-1 C# 40 defines 18 contextual keywords that have a special meaning in certain contexts In those contexts, they act as keywords Outside those contexts, they can be used as names for other program elements, such as variable names Thus, they are not technically reserved As a general rule, however, you should consider the contextual keywords reserved and avoid using them for any other purpose Using a contextual keyword as a name for some other program element can be confusing and is considered bad practice by many programmers The contextual keywords are shown in Table 2-2

4 (a)

Part I:

C# exception handling is managed via four keywords: try, catch, throw, and finally They form an interrelated subsystem in which the use of one implies the use of another Throughout the course of this chapter, each keyword is examined in detail However, it is useful at the outset to have a general understanding of the role each plays in exception handling Briefly, here is how they work Program statements that you want to monitor for exceptions are contained within a try block If an exception occurs within the try block, it is thrown Your code can catch this exception using catch and handle it in some rational manner System-generated exceptions are automatically thrown by the runtime system To manually throw an exception, use the keyword throw Any code that absolutely must be executed upon exiting from a try block is put in a finally block

At the core of exception handling are try and catch These keywords work together, and you can t have a catch without a try Here is the general form of the try/catch exception-handling blocks: try { // block of code to monitor for errors } catch (ExcepType1 exOb) { // handler for ExcepType1 } catch (ExcepType2 exOb) { // handler for ExcepType2 }

Here, ExcepType is the type of exception that has occurred When an exception is thrown, it is caught by its corresponding catch clause, which then processes the exception As the general form shows, more than one catch clause can be associated with a try The type of the exception determines which catch is executed That is, if the exception type specified by a catch matches that of the exception, then that catch is executed (and all others are bypassed) When an exception is caught, the exception variable exOb will receive its value Actually, specifying exOb is optional If the exception handler does not need access to the exception object (as is often the case), there is no need to specify exOb The exception type alone is sufficient For this reason, many of the examples in this chapter will not specify exOb Here is an important point: If no exception is thrown, then a try block ends normally, and all of its catch clauses are bypassed Execution resumes with the first statement following the last catch Thus, a catch is executed only if an exception is thrown

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Here is a simple example that illustrates how to watch for and catch an exception As you know, it is an error to attempt to index an array beyond its boundaries When this error occurs, the CLR throws an IndexOutOfRangeException, which is a standard exception