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The code will not work for two reasons: CurrencyTrader is abstract and thus cannot be instantiated ExchangeRate is protected and cannot be referenced externally This broken code puts us in a bind Up to this point, whenever we tested code, we assumed all of the pieces that were to be tested could be referenced One solution would be to change the scope declarations and remove the abstract and protected keywords Yes, that solves the problem, but it is a cop-out The better approach is to test CurrencyTrader as it was intended to be used: as a class that is derived from So, the solution is to use inheritance and create a test class that derives from CurrencyTrader, as follows: class TestCurrencyTrader : CurrencyTrader { public void InitializeExchangeRate() { ExchangeRate = 1000; } } TestCurrencyTrader is a test class that is added to the test source code.

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Note Alternatively, you can execute the GetDepartments.sql script file in the BalloonShop database,

A colon (:) separates the class identifier from the subclassed class identifier, CurrencyTrader To expose a method outside the class declaration, you use the public modifier, even though the class does not have a public modifier Inheritance means identifiers that are scoped protected or public can be referenced in the subclassed type For example notice how ExchangeRate seems to be all on its own, without any object reference The lonely reference to ExchangeRate is fine, because the base class CurrencyTrader has an identifier with that name The property ExchangeRate can be referenced locally because of its protected scope The identifier ExchangeRate has an implied this reference (thisExchangeRate), so it is not necessary to add that, unless you have multiple identifiers with the same name, or you want to explicitly reference a certain identifier.

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1. Make sure the data connection to the BalloonShop database is expanded and selected in Database Explorer. Choose Data Add New Stored Procedure. Alternatively, you can right-click the Stored Procedures node in Database Explorer and select Add New Stored Procedure. 2. Replace the default text with your GetDepartments stored procedure: CREATE PROCEDURE GetDepartments AS SELECT DepartmentID, Name, Description FROM Department 3. Press Ctrl+S to save the stored procedure. Unlike with the tables, you won t be asked for a name because the database already knows that you re talking about the GetDepartments stored procedure.

And now the tests will not test CurrencyTrader, but will test TestCurrencyTrader, which should contain some verification code to make sure everything works correctly..

5. In the By Changing Cell box, type or click cell C19. 6. Click OK, and click OK again. Answer: If a = 2, b = 4, c = 3, d = 65, x = 5, and y = 7, then z = 9.

Note Saving the stored procedure actually executes the SQL code you entered, which creates the stored

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Let s dig a bit deeper into how the three types of scope work. To start, consider the CurrencyTrader implementation: public abstract class CurrencyTrader { private double _exchangeRate; protected double ExchangeRate { get { return _exchangeRate; } set { _exchangeRate = value; } } protected double ConvertValue(double input) {

procedure in the database. After saving the procedure, the CREATE keyword becomes ALTER, which is the SQL command that changes the code of an existing procedure.

4. Now test your first stored procedure to see that it s actually working. Navigate to the GetDepartments stored procedure node in Database Explorer and select Execute, as shown in Figure 4-13.

return _exchangeRate * input; } protected double ConvertValueInverse(double input) { return input / _exchangeRate; } } The new class ActiveCurrencyTrader subclasses CurrencyTrader and is written as follows: public class ActiveCurrencyTrader : CurrencyTrader { } The data member CurrencyTrader_exchangeRate is declared as private, and thus can be referenced only in CurrencyTrader If _exchangeRate had no declaration, private scope would be implied For example, the following code would not compile public class ActiveCurrencyTrader : CurrencyTrader { public void Method() { _exchangeRate = 1000; } } The ActiveCurrencyTrader class is not part of CurrencyTrader, and thus _exchangeRate cannot be referenced Considering the ActiveCurrencyTrader class, ExchangeRate, which has been declared as protected, could be referenced as follows: public class ActiveCurrencyTrader : CurrencyTrader { public void Method() { ExchangeRate = 1000; } } Protected scope means only those classes that derive from a class can view the methods, properties, or data members.

Figure 4-13. Executing a stored procedure from Visual Web Developer 5. After running the stored procedure, you can see the results in the Output window (see Figure 4-14). You can open the Output window by choosing View Other Windows Output, or by pressing Ctrl+Alt+O.

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