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When writing test routines, you will need to organize the source code, and that means figuring out to which project the tests are added. For the calculator application, you could place the test routines within the Calculator class library. However, doing that is not the proper approach due to distribution of the class library and correct testing context. Remember that the test routines must be identical to how the code will be used. Thus, the appropriate place for the test routines is in their own application. The ideal approach is to create another application that represents the tests. Figure 2-5 illustrated how a Windows and console application could use the Calculator class library. Figure 2-9 adds the testing console application that also uses the class library.

Note The ISNULL method is used to return 0 instead of a NULL total amount (this happens if the shopping

cart is empty). You must do this because the business tier expects to receive a numerical value as the amount.

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3. Click a cell in the group of cells that you want to filter. 4. Click Data Filter Advanced Filter. 5. Click Filter the List In-Place to hide rows that do not match your filter criteria, or click Copy to Another Location to copy rows that match your filter criteria to another area of the worksheet. 6. Click the List Range box, and then type or select the cell reference for the group of cells that you want to filter. 7. Click the Criteria Range box, and then type or select the cell reference for the criteria range, including the criteria range s column labels. 8. If you clicked Copy to Another Location in step 5, in the Copy To box, type or select the upper-left cell where you want to copy the rows that match your filter criteria. 9. Optionally, if you don t want to display rows with the exact same values more than once, select the Unique Records Only box. 10. Click OK.

Figure 2-9. Adding the testing console application, an application with limited functionality used to exercise the exposed functionality of the Calculator class library The testing console application is like the console application created in 1, and it references the Calculator class library. Both projects should be part of the Calculator solution. Go ahead and add the TestCalculator project to the Calculator solution. Remember to add a reference to the Calculator class library (right-click References and choose Add Reference Project Calculator). Remember to set TestCalculator as the startup project for debugging purposes. Figure 2-10 shows the TestCalculator and Calculator projects in Solution Explorer.

This stored procedure is different from the others in that it returns a single value instead of a result set. In the business tier, you ll retrieve this value using the ExecuteScalar method of the DbCommand object.

// Version information for an assembly consists of the following four values: // // Major Version // Minor Version // Build Number // Revision // // You can specify all the values or you can default the Build and Revision Numbers // by using the '*' as shown below: // [assembly: AssemblyVersion("1.0.*")] [assembly: AssemblyVersion("1.0.0.0")] [assembly: AssemblyFileVersion("1.0.0.0")] Notice that all of the assembly descriptors are declared as .NET attributes. The bolded attributes reference the version and culture of the assembly. By adjusting these attributes, you can tweak which assembly is loaded, as explained in more detail in the upcoming Versioning Assemblies section. To load a specific assembly, you need to create an assembly name, like this: AssemblyName assemblyName = new AssemblyName(value); Assembly assembly = Assembly.Load(assemblyName); object obj = assembly.CreateInstance(info.TypeName); The variable value contains the precise .NET identifier of the assembly and is passed as a constructor parameter to AssemblyName. The resulting instance is passed to the method Assembly.Load(), which loads the assembly. The instantiation of the type follows the same sequence as previously outlined. Note that there is no indication of where the assembly is located. The default locations that are probed are the local working directory of the executing process and the GAC.

You ll write the business layer methods for the shopping cart in a separate class named ShoppingCartAccess. The ShoppingCartAccess class supports the functionality required for the presentation layer of the shopping cart and calls the stored procedures you wrote earlier. For example, when the visitor clicks the Add to Cart button, a method of the ShoppingCartAccess class named AddProduct is called. None of the methods receives a CartID parameter, which might appear strange because all the stored procedures you ve written so far require a CartID parameter. So, how does the AddItem method know which CartID to send to the ShoppingCartAddItem stored procedure

Runtime by Don Box with Chris Sells (Addison Wesley, 2002).

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