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The reason the test code will not work is that any type that is not declared with public scope is private to the solution containing the declaration. You may be thinking, That s great you declare a type that you cannot instantiate, So, how can I use that type The scope declarations are not a mistake and illustrate a design pattern called a factory. A factory is a way of abstracting the instantiation away from the caller so that the interface can vary from its implementation. In our restaurant analogy, it means when you want a waiter, you don t want to need to know his name. You would rather have a generic mechanism where the restaurant presents to you the waiter. Otherwise, to eat at a restaurant, you would need to know the name of your waiter before being able to order something. That would be inefficient. The correct way of defining a factory is as follows: namespace LibTax { public static class EngineCreator { public static ITaxEngine CreateSurtaxTaxEngine() { return new LibTax.Surtax.TaxEngine(); } } } The factory is typically declared as a static method (CreateSurtaxTaxEngine()) on a class. So that the factory is never instantiated, you add the static declaration to the front of the class declaration. In the implementation of CreateSurtaxTaxEngine(), the type LibTax.Surtax. TaxEngine is instantiated, and the instance is downcast to the interface type ITaxEngine.

8. Press Ctrl+S to save the table again. You ll be warned about the Category and Department tables being updated and asked for confirmation. This confirms again that a foreign-key relationship affects both tables that take part in the relationship. Click Yes.

Note Adding a static declaration that is prefixed to the class is a good way to ensure a type does not

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Okay, so you created and then enforced a relationship between the Category and Department tables. But how does it work, and how does it affect your work and life Let s study how you implemented this relationship. In the Category table, apart from the primary key and the usual CategoryID, Name, and Description columns, you added a DepartmentID column. This column stores the ID of the department the category belongs to. Because the DepartmentID field in Category doesn t allow NULLs, you must supply a department for each category. Furthermore, because of the foreign-key relationship, the database won t allow you to specify a nonexistent department. Actually, you can ask the database not to enforce the relationship. In the Foreign Key Relationships dialog box where you created the relationship, you can set a number of options for your foreign key. We left them with the default value, but let s see what they do: Check Existing Data On Creation: If you set this to Yes, it doesn t allow the creation of the relationship if the existing database records don t comply with it. In other words, the relationship can t be created if orphaned categories are in the database (you have categories with a DepartmentID that references a nonexistent department).

get inadvertently instantiated. From a design perspective, static is like abstract in that they both enforce a particular usage.

When Solver stops, regardless or whether it finds a solution, the Solver Results dialog box appears and displays a message If this message is something other than that Solver found a solution, you can use the following troubleshooting tips based on the type of message displayed: Solver Cannot Improve the Current Solution All Constraints Are Satisfied: This message is displayed when Solver finds an approximate solution but cannot find a better set of values than those displayed This is either because further accuracy is simply not achievable or the Precision setting is too low To try to improve the current solution, try increasing the Solver Options dialog box s Precision setting to a larger number, and then running the problem again Stop Chosen When the Maximum Time Limit Was Reached: This message is displayed when Solver reaches the maximum amount of time specified without finding a satisfactory solution.

management and web development, currently studying distributed application architectures for his PhD. Cristian has published several technical books with Apress, Packt Publishing, Wrox, and Sitepoint, and he is the manager and the former technical architect of OKazii.ro (www.okazii.ro), the largest e-commerce web site in Romania. You can reach Cristian through his personal web site at www.cristiandarie.ro.

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