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You need to create the GetDepartments stored procedure, which returns department information from the Department table. This stored procedure is part of the data tier and will be accessed from the business tier. The final goal is to have this data displayed in the user control. The SQL code that retrieves the necessary data and that you need to save to the database as the GetDepartments stored procedure is the following: SELECT DepartmentID, Name, Description FROM Department This command returns all the department information.

Caution Unless you have a specific reason to do so, never ask for all columns (using the * wildcard) when you only need a part of them. This generates more traffic and stress on the database server than necessary and slows down performance. Moreover, even if you do need to ask for all columns in the table, it s safer to mention them explicitly to protect your application in case the number or order of columns change in future.

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At this point, the ExchangeRate property is a mechanical property that will be used by any class that subclasses CurrencyTrader. So now we need to decide whether access to the property should be restricted. The answer is that it should be restricted to only those developers who truly understand how to convert currencies. Access should be restricted to those classes that will subclass CurrencyTrader. Following is the rewritten version of CurrencyTrader. public abstract class CurrencyTrader { private double _exchangeRate; protected double ExchangeRate { get { return _exchangeRate; } set { _exchangeRate = value; } } } The bolded code highlights three examples of scope access: public: The type, method, or property can be accessed and referenced by any other type. In the context of a crowd of people, it means anyone can reach into your pocket and inspect your wallet. private: The method or property can be accessed and referenced only by the type declaring the method or property. In the context of a crowd of people, it means only you can reach into your pocket and inspect your wallet. protected: The method or property can be accessed and referenced by the type declaring the method or property or by types that subclass the declaring type. In the context of a crowd of people, it means only you and people who you have allowed can reach into your pocket and inspect your wallet. If you happen to declare a type, method, or property without a scope modifier, the default is assumed, which means private is implied. The private and protected modifiers cannot be assigned to a type. You ll learn more about other modifiers and details about type scope declarations in the next chapter.

As with data tables, after you know the structure, implementing the stored procedure is a piece of cake. Now that you know the SQL code, the tools will help you save the query as a stored procedure easily.

The rewritten version of CurrencyTrader will cause the test code to break, because it uses the abstract keyword, and abstract types cannot be instantiated directly. Here is the broken code: CurrencyTrader cls = new CurrencyTrader(); cls.ExchangeRate = 123.44;

For the following values: a=2 b=4 c=3 d = 65 x=5 y=7 determine the value for z. 1. Type the following values in the following cells: A17: 2 A18: 4 A19: 3 C17: 5 C18: 7 2. Click Tools Goal Seek. 3. In the Set Cell box, type or click cell A20. 4. In the To Value box, type 65.

The syntax for creating a stored procedure that has no input or output parameters is as follows: CREATE PROCEDURE <procedure name> AS <stored procedure code> If the procedure already exists and you just want to update its code, use ALTER PROCEDURE instead of CREATE PROCEDURE. Stored procedures can have input or output parameters. Because GetDepartments doesn t have any parameters, you don t have to bother about them right now. You ll learn how to use input and output parameters in 5. In the following exercise, you ll add the GetDepartments stored procedure to your database.

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