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private void ctxtPhotoCal_MenuClick(object sender, System.EventArgs e) { PhotoMenuItem mi = sender as PhotoMenuItem; if ((mi != null) && (DisplayPhotoEditDlg(mi.tag))) { UpdateCalendar(); } }

// Use the NullReferenceException using System; class X { int x; public X(int a) { x = a; } public int Add(X o) { return x + ox; } } // Demonstrate NullReferenceException class NREDemo { static void Main() { X p = new X(10); X q = null; // q is explicitly assigned null int val;

Part I:

Compile and run the application to see how all this code works. Click on a date where one or more photographs were taken and be amazed as a context menu pops up with the corresponding photos. Also try clicking on other aspects of the control to see what happens. In particular, see what happens when you click on the month and year in the title of the control. Note that your ability to alter the month and year displayed is restricted by the range of dates represented in the photo album.

try { val = pAdd(q); // this will lead to an exception } catch (NullReferenceException) { ConsoleWriteLine("NullReferenceException!"); ConsoleWriteLine("fixing\n"); // Now, fix it q = new X(9); val = pAdd(q); } ConsoleWriteLine("val is {0}", val); } }

The PhotoMenuItem class developed in this section extends the MenuItem object provided by the Windows Forms namespace. This technique is useful when you need a class that is similar to an existing control, and the ability to downcast objects in C# ensures that you can access the additional members of your derived class in a type-safe manner. You can also build custom controls by extending the Control class directly. Windows Forms also provides a UserControl class that is specifically intended for building customized container controls. The Project menu in Visual Studio .NET includes an Add User Control item for creating such a control. There is a walkthrough in the .NET documentation entitled Authoring a User Control with Visual C# that introduces this concept. Custom controls can also be tightly integrated into the Toolbox and other parts of Visual Studio .NET. The System.Windows.Forms.Design namespace contains the classes and other types to support such integration. If you are interested in this topic, search for more information at any of the .NET web sites listed in appendix D. In particular, as of this writing there is an article by Shawn Burke entitled Writing Custom Designers for .NET Components at the Microsoft Developer Network at msdn.microsoft.com.

The output from the program is shown here:

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 An interesting exception is StackOverflowException, which is thrown when the system stack is overrun One situation in which this can happen is when a recursive method runs wild Because the stack is exhausted, a StackOverflowException can t be caught by your program Instead, a stack overflow results in the abnormal termination of your program