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Passing provider-specific classes around in the application tier can be tempting sometimes. For example, you might decide to wrap a live OracleDataReader object in a business object and pass that business object around to other functions. This practice is, of course, a bad idea. It makes the life of the object harder to trace. Also, if you had to change the provider to a different one, like ODBC.NET, you would have to go through the entire application looking for these objects.

value < 2 Set upper bound = current record number (the cut-to record s index in the set)

.NET 2.0 extends the layout system with layout engines. Layout engines play the same role as the custom layout manager shown in the previous example, with a few minor differences: All layout engines inherit from the abstract base class LayoutEngine in the System. Windows.Forms.Layout namespace. (You won t actually see the basic set of layout engine classes in this namespace, because they are hidden, internal classes.) When inheriting from LayoutEngine, the class must override two methods: InitLayout() and Layout(). Layout engines don t link themselves to controls. Instead, wherever possible controls bind themselves to layout engines. This allows a single layout manager to be reused for multiple controls, saving memory. To accommodate this design, each control has a LayoutEngine property, which provides a reference to the layout engine that should be used for organizing child controls.

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value > 2 Set lower bound = current record number (the cut-to record s index in the set)

Many developers are fond of simply getting the data layer to pass back raw datasets into the logic tier. After all, DataSets are pretty versatile objects and can be easily passed around. From a software design perspective, however, this practice is not desirable, since datasets (sometimes) contain raw data that has not been converted into the right types. Take the System.Guid .NET data type for example. A developer may decide to store a globally unique identifier (GUID) value in the Oracle database as a RAW(16) data type. When this data is retrieved into a dataset, it exists as a byte array, not a readily usable System.Guid object. A better alternative would be to encapsulate each retrieved DataSet within a business object and to pass the business object to the logic tier. The business object would handle the mapping of the raw data structures to application-level entities. This way, the logic tier would never need to bother itself with the underlying conversions and formatting necessary before consuming the data.

Note In some cases, controls and layout engines do have a one-to-one relationship. One key example is

By default, the Control.LayoutEngine is set to an instance of the internal DefaultLayout class (from the System.Windows.Forms.Layout namespace). This class implements the dockand-anchor functionality you learned about in 3. The Control.LayoutEngine property is protected and read-only, so you don t set it directly. Instead, to bind a control to a layout engine, you must derive a new control class. Because the chief goal of a layout engine is to organize child controls, you would only use this technique to create new types of containers. For example, you might design a new type of custom toolbar, and override its Control.LayoutEngine property so it returns a custom layout engine object that can organize the individual toolbar buttons the way you want.

When you look at code either your own or other people s examine the for and while loops Tip closely to understand the number of elements actually being operated on, and what s going on inside those loops. A function or formula that may seem complicated and overly complex at first glance may be much more efficient than a simple-looking function because it uses a process of elimination to reduce the number of times a loop is executed. So, the bottom line is that you should pay attention to what s going on in looping code, and don t judge a book by its cover!

As mentioned in the previous section, raw data structures retrieved from a data source should be mapped to an application entity such as a business object. You should formulate a strategy for each mapping since it may not always be a 1:1 correlation. Tables with master-detail relationships in the database, for instance, must be mapped to the corresponding business objects with this relationship intact.

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