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Finally, the layout code fires again when the form becomes visible: Called: Affected Control: tabPage1 Affected Property: Visible If you switch to the second tab and back again, the layout code runs once more with the same message, which indicates that the tab page has become visible again. To optimize your layout code, you may choose to ignore some layout operations or perform less work depending on the type of action that triggered the layout. However, it s usually difficult and unreliable to code this logic, particularly because LayoutEventArgs.AffectedProperty returns a simple string and isn t guaranteed. In fact, the AffectedControl and AffectedProperty are set by the caller when calling PerformLayout(): control.PerformLayout(control, "Parent") If you don t supply these parameters, the control defaults to the control on which you re calling PerformLayout(), and the AffectedProperty string defaults to Bounds. A safer optimization is to use the SuspendLayout() and ResumeLayout() methods. By placing these calls before and after you add the check boxes, you can reduce the number of layout events from 12 to 3. // Create and attach the layout manager. SingleLineFlowLayoutManager layoutManager = new SingleLineFlowLayoutManager(tabPage1, 20); tabPage1.SuspendLayout(); // (Add 10 sample checkboxes.) tabPage1.ResumeLayout();

As I mentioned in 4, the data layer is one of the most fundamental parts of any application, since it drives all data access between your application and the data source. For example, a data tier that is too rigid would make the introduction of changes difficult. On the other hand, one that implements too many abstraction layers would make the code unreadable and unnecessarily complex. The following sections describe some considerations to keep in mind when designing your data tier.

Note Remember, it won t help to call SuspendLayout() on the entire tab control because that will only

In our scenario, upper = 5 (number of elements in set), lower = 1 (first record) Determine upper and lower bounds of data set Repeat until upper bound = lower bound

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suppress layout events for controls that are directly contained by the TabControl (namely, TabPage controls). It won t affect the controls inside each TabPage.

Your data source may be based on an Oracle database today, but that might change to become a DB2 or MySQL database tomorrow. The nature of business requirements today more often than not requires integration with a multitude of data sources, some of which you cannot foresee during development. By implementing an additional layer of abstraction (via interfaces) between your data layer and the data source, you can make your data layer extensible and allow new data sources to be easily snapped in to your framework.

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The SimpleFlowLayoutManager is a good example of custom layout logic, but it has a few glaring issues: The layout manager doesn t give a good design-time representation of what the form will look like. That s because the layout logic isn t performed until the layout manager class is created at runtime. As a result, the child controls won t be organized in the IDE view at design time. Instead, they will be reorganized when the program is launched and your code attaches the layout manager.

The code is still quite simple. You could extend this example layout manager so that it lays out controls in multiple columns or a fixed-size table. However, it will take more time and code. The layout manager treats all controls equally. In some cases, you ll want a more customizable layout that takes individual control settings into account. For example, the default layout provided by Windows Forms gives every control a Size and a Location property that is used to determine where the control is placed in the container. You might want to add other layout properties (for example, a Justification, Column, or LayoutListPriority property) to standard controls, which your layout manager could then take into account. To achieve this, you would need to design your layout manager as a custom extender provider (see 27). In .NET 1.x, there was no alternative to creating custom layout classes by hand. However, .NET 2.0 adds a new layout engine system that solves these problems.

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