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constructor and all of its base type s type constructors to be called . In addition, interfaces implemented by the types must also have their type constructors called . The CLR doesn t offer this behavior . However, the CLR does offer compilers and developers the ability to provide this behavior via the RunClassConstructor method offered by the System.Runtime.CompilerServices.RuntimeHelpers type . Any language that requires this behavior would have its compiler emit code into a type s type constructor that calls this method for all base types . When using the RunClassConstructor method to call a type constructor, the CLR knows if the type constructor has executed previously and, if it has, the CLR won t call it again .

You can also specify that a particular route segment s value must match a constraint that you define. This might be the length of the segment, a date range, or any string data validation that you can define. If a URL does not meet the constraint, the route is not used to process the request. You define route constraints with regular expressions or by using objects that implement the IRouteConstraint interface. You then add each constraint to a RouteValueDictionary object and pass that to routes.MapRoute(). As an example, suppose you want to add a route definition that searches for the month/year numeric pattern in the URL (as in 12/2012). You could do as shown in the following code. This code creates default values for month and year based on the current month and year. It then sets a route constraint for each segment by using regular expressions.

Combine similar routines by parameterizing them. Separate routines whose behavior depends on parameters passed in. Pass a whole object rather than specific fields. Pass specific fields rather than a whole object. Encapsulate downcasting.

The extremely versatilely useful line charts are very similar to column and bar charts when it comes to their basic structure and technical use . The chart type has already been presented with different models in previous chapters . The creation of a line chart as well as the development and formatting of its data series was explained in 2 . For this reason, the descriptions of the examples compiled in the file 0807_Lines.xlsx can primarily focus on other aspects and present ideas whose implementation is also possible in other chart types, either directly or analogously . On the Companion CD Open the file \Samples\0807_Lines.xlsx on the CD-ROM .

Different Types of Visual C++ Assertions Even though I define all my C++ assertion macros and functions to just plain ASSERT, which I'll talk about in a moment, I want to quickly go over the different types of assertions available in Visual C++ and provide a little information about their implementation. That way, if you see one of them in someone else's code, you can recognize it. I also want to alert you to the problems with some of the implementations. assert, _ASSERT, and _ASSERTE The first type of assertion is from the C run-time library, the ANSI C standard assert macro. This version is portable across all C compilers and platforms and is defined by including ASSERT.H. In the Windows world, if you're working with a console application and it fails an assertion, assert will send the output to stderr. If your application is a Windows graphical user interface (GUI) application, assert will show the assertion failure as a message box. The second type of assertion in the C run-time library is specific to Windows. These assertions are _ASSERT and _ASSERTE, which are defined in CRTDBG.H. The only difference between the two is that the _ASSERTE version also prints the expression passed as its parameter. Because the expression is so important to have, especially when your test 98