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The program creates a class called X that defines a member called x and the Add( ) method, which adds the invoking object s x to the x in the object passed as a parameter In Main( ), two X objects are created The first, p, is initialized The second, q, is not Instead, it is explicitly assigned null Then pAdd( ) is called with q as an argument Because q does not refer to any object, a NullReferenceException is generated when the attempt is made to obtain the value of qx

Although C# s built-in exceptions handle most common errors, C# s exception-handling mechanism is not limited to these errors In fact, part of the power of C# s approach to exceptions is its ability to handle exception types that you create You can use custom exceptions to handle errors in your own code Creating an exception is easy Just define a class derived from Exception Your derived classes don t need to actually implement anything it is their existence in the type system that allows you to use them as exceptions

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InfoView shortcuts work much the same way as Microsoft Office shortcuts: they act as pointers to the original document In this way, shortcuts may make your navigation to reports simpler, but they do not allow you to make changes to the report (unless you are also the owner of the public report)

hierarchy that was originally reserved for application-related exceptions However, Microsoft no longer recommends this Instead, at the time of this writing, Microsoft recommends deriving custom exceptions from Exception For this reason, this approach is used here The exception classes that you create will automatically have the properties and methods defined by Exception available to them Of course, you can override one or more of these members in exception classes that you create

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When creating your own exception class, you will generally want your class to support all of the constructors defined by Exception For simple custom exception classes, this is easy to do because you can simply pass along the constructor s arguments to the corresponding Exception constructor via base Of course, technically, you need to provide only those constructors actually used by your program Here is an example that makes use of a custom exception type At the end of 10 an array class called RangeArray was developed As you may recall, RangeArray supports single-dimensional int arrays in which the starting and ending index is specified by the user For example, an array that ranges from 5 to 27 is perfectly legal for a RangeArray In 10, if an index was out of range, a special error variable defined by RangeArray was set This meant that the error variable had to be checked after each operation by the code that used RangeArray Of course, such an approach is error-prone and clumsy A far better design is to have RangeArray throw a custom exception when a range error occurs This is precisely what the following version of RangeArray does:

// Use a custom Exception for RangeArray errors using System; // Create a RangeArray exception class RangeArrayException : Exception { /* Implement all of the Exception constructors Notice that the constructors simply execute the base class constructor Because RangeArrayException adds nothing to Exception, there is no need for any further actions */ public RangeArrayException() : base() { } public RangeArrayException(string message) : base(message) { } public RangeArrayException(string message, Exception innerException) : base(message, innerException) { } protected RangeArrayException( SystemRuntimeSerializationSerializationInfo info, SystemRuntimeSerializationStreamingContext context) : base(info, context) { } // Override ToString for RangeArrayException public override string ToString() { return Message; } } // An improved version of RangeArray class RangeArray { // Private data int[] a; // reference to underlying array int lowerBound; // smallest index int upperBound; // largest index // An auto-implemented, read-only Length property public int Length { get; private set; }

In Step 3 in the preceding section, when you choose Add To My Favorites from the Organize drop-down, or when you choose Add Short Cuts To New Folder, InfoView creates a pointer to the original file:

y =

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