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When adding stored procedure parameters, you should use exactly the same name, type, and size as in the stored procedure. You don t always have to do it, however, because SQL Server is very flexible and automatically makes type conversions. For example, you could add @DepartmentID as a VarChar or even NVarChar, as long as the value you set it to is a string containing a number. We recommend always specifying the correct data type for parameters, however, especially in the business tier. The DbParameter object will always check the value you assign to see if it corresponds to the specified data type, and if it doesn t, an exception is generated. This way, you can have the data tier check that no bogus values are sent to the database to corrupt your data. The C# methods in the business tier (the CatalogAccess class) always take their parameters from the presentation tier as strings. We chose this approach for the architecture to keep the presentation tier from being bothered with the data types; for example, it simply doesn t care what kind of product IDs it works with (123 is just as welcome as ABC). It s the role of the business tier to interpret the data and test for its correctness.

In this section, you will use one-variable and two-variable data tables to forecast various race paces. Simply defined, a race pace is the average time for a given distance between two points. Paces are usually expressed as the average number of minutes it takes to run an average kilometer or mile. So, if you run a 10-minute-per-mile pace, this means it takes you an average of 10 minutes to run an average mile.

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Although the purpose of the lighting system is to control the lighting, some rooms should not be controlled by the system. Perhaps the room is private, or controlling its lighting would cause problems. For example, should a bedroom in a house be controlled by the lighting controller If the lighting controller controls the lighting in the bedroom, it might turn off the lights while a person is reading. Or maybe it will turn on the lights when the person has decided to sleep in. Of course, the person could just switch the light on or off manually, but that is disruptive. The inconvenience of the controller getting it wrong outweighs the benefit of the controller getting it right, so the controller should not deal with this room. The definition of an interface that indicates that the controller should do nothing is as follows (in the controller library LibLightingSystem): public interface INoRemoteControlRoom: IRoom { } As you can see, INoRemoteControlRoom lacks methods and properties, like our placeholder interface IRoom. However, in this case, there are no methods or properties because the kernel system does not require them. The idea behind the INoRemoteControlRoom interface is to indicate that the type implementing the interface is a room, but a room that should not be managed by the controller. Using the bedroom as an example, the implementation is as follows (defined in the Home project): class Bedroom : INoRemoteControlRoom { }

After executing a stored procedure that has output parameters, you ll probably want to read the values returned in those parameters. You can do this by reading the parameters values from the DbParameter object after executing it and closing the connection. In your business tier code, you ll have a line like this, which will retrieve the value of the @HowManyProducts output parameter: int howManyProducts = Int32.Parse(comm.Parameters["@HowManyProducts"].Value.ToString()); In this example, ToString is called to convert the returned value to a string, which is then parsed and transformed into an integer.

The definition of the bedroom allows the kernel to use an instance of a room, as follows: IRoom[] rooms = new IRoom[ 10]; rooms[0] = new Bedroom(); ... if( rooms[0] is INoRemoteControlRoom) { // Do nothing and potentially change course in code } This code creates an array of rooms and assigns the index 0 to an instance of Bedroom. The if statement asks if the IRoom instance in index 0 is of type INoRemoteControlRoom.

Most of your business tier code will consist of the new code you ll add to the CatalogAccess class. That code will use a few new configuration settings that you ll add to web.config: ProductsPerPage stores the maximum number of products to list on a page of products. If the entire list contains more items, the paging controls (next page/previous page) appear. ProductDescriptionLength stores the length of the product descriptions to be used in product lists. The entire description is shown only in the product details page. SiteName stores the name of your store, which will be used to compose catalog page names. Let s add these settings in a short exercise.

Note Using placeholder interfaces and inheritance sets up a very powerful architecture that allows you to

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