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A type cast is necessary when you want to cast a base class instance to a derived class instance. Following is the source code for a forced type cast, assuming the inheritance hierarchy from the previous cast. DerivedClass backToDerived = (DerivedClass)baseCls; The forced cast is the right side of the equal sign. The cast is the desired type enclosed in parentheses. The cast is forced because a conversion to the desired type will occur, regardless if it is possible or not. If the cast is not possible, a cast exception is thrown. Another way to perform a type cast is to use a query cast, as illustrated by the following code, again assuming the inheritance hierarchy of this section. DerivedClass backToDerived = baseCls as DerivedClass; In the code, the cast involves using the keyword as and the type to which to cast. This cast is a query because a cast will be attempted. If the cast is successful, then an instance of the type is assigned to the variable backToDerived. If the cast is not possible, then backToDerived is assigned a null value. No exception is thrown. This casting technique is possible only for reference types.

In the stored procedures that return pages of products, you ll save the complete list of products in a TABLE variable, allowing you to count the total number of products (so you can tell the visitor the number of pages of products) before returning the specified page. The code listing that follows shows you how to create a TABLE variable named @Products: -- declare a new TABLE variable DECLARE @Products TABLE (RowNumber INT, ProductID INT, Name NVARCHAR(50), Description NVARCHAR(MAX)) After creating this variable, you ll populate it with data using INSERT INTO: -- populate the table variable with the complete list of products INSERT INTO @Products SELECT ROW_NUMBER() OVER (ORDER BY Product.ProductID) AS Row, ProductID, Name, Description FROM Product You can then retrieve data from this table object like this: -- extract the requested page of products SELECT Name, Description FROM @Products WHERE RowNumber >= 6 AND RowNumber <= 10

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In this section, you will use Goal Seek to forecast next year s total club membership dues. This section s exercises are available in the Excel workbook named Ridge Running Exercises.xls, which is available for download from the Source Code area of the Apress web site (http://www.apress.com). These exercises data is on the workbook s Membership Dues worksheet, as shown in Figure 5-1.

In this chapter, you learned about interfaces and implementations. You should keep the following points in mind: Using interfaces is not like using inheritance. They are two separate designs, even though interfaces will use inheritance. Interfaces at an abstract level imply ideas of how you would like your application to work. Ideas when implemented as interfaces should be general and applicable to multiple application implementations for the domain. Ideas are implemented using C# interfaces. And interfaces are implemented using classes or structures. But note that interfaces are reference types. Interfaces and implementations are components. Factories are used to instantiate implementations and return an interface instance. Using a factory means that the user of an interface does not need to know which implementation to instantiate. Interfaces can be considered as attributes that might be targeting a specific characteristic of an implementation. However, as illustrated in the previous chapter, interfaces do not expose internal state or the internal workings of the implementations. Components are a fundamental way of developing code and should be your primary way of writing code. For the remainder of this book, interfaces will be used whenever possible. Take notice and try to understand what the idea behind the interface is.

It s time to add the new stored procedures to the BalloonShop database, and then you ll have the chance to see them in action. For each stored procedure, you ll need its functionality somewhere in the presentation tier. You may want to refresh your memory by having a look at the first four figures in 3. In this chapter, the data you need from the database depends on external parameters (such as the department selected by a visitor, the number of products per pages, and so on). You ll send this data to your stored procedures in the form of stored procedure parameters. The syntax used to create a stored procedure with parameters is CREATE PROCEDURE <procedure name> [( <parameter name> <parameter type> [=<default value>] [INPUT|OUTPUT], <parameter name> <parameter type> [=<default value>] [INPUT|OUTPUT], ... ... )] AS <stored procedure body>

Here are some things for you to do to apply what you ve learned in this chapter: 1. Implement your own tax system using the predefined base classes.

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