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behavior. But this works only if you design your inheritance hierarchy properly. You need to understand that behavior depends on the type that you have from the inheritance tree. And if you are not careful, you can get some very odd side effects. C# allows you to explicitly define what each method does, and you should think very hard about what each method should do.

Figure 4-24. Oops! First, this exception is caught in the data access tier, which simply reports it and then rethrows it. The report from the data tier generates an email with contents like shown in Figure 4-25.

Another way to implement a shape is to use components. Using components means to define an idea, and then define an implementation of the idea. Designing and implementing components is not similar to designing and implementing inheritance trees. With inheritance, you need to consider type casting, base class functionality, and how to override or overload methods or properties. (Type casting is when you cast to a specific type with or without an explicit cast operator.) With components, you need to think in terms of ideas and how they would be implemented as interfaces.

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This email contains all the significant details about the error. However, the error is rethrown, and because it isn t handled anywhere else, it s finally caught by the presentation tier, which displays the nice error page. A second email is generated, which should be taken seriously because the error caused the visitor to see an error message: Exception generated on Tuesday, June 24, 2008, at 1:07 AM Page location: /Default.aspx Message: Exception of type 'System.Web.HttpUnhandledException' was thrown. Source: System.Web Method: Boolean HandleError(System.Exception) Stack Trace: at System.Web.UI.Page.HandleError(Exception e) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsy ncPoint, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPo int, Boolean includeStagesAfterAsyncPoint) at System.Web.UI.Page.ProcessRequest() at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) at System.Web.UI.Page.ProcessRequest(HttpContext context) at ASP.default_aspx.ProcessRequest(HttpContext context) in c:\Windows\M icrosoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files\root\0a7ff8cb\7bc2fe51\App_Web_tvdzzowf.2.cs:line 0 at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpA pplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

To solve this problem, correct the contents of the Cell Reference box to contain a valid cell reference, and then click OK again Constraint Must Be a Number, Simple Reference, or Formula with a Numeric Value: This message appears in the Add/Change Constraint dialog box if you click OK and the Constraint box is empty or doesn t contain a reference to a number, a cell reference, or a formula with a numeric value To solve this problem, correct the contents of the Constraint box to reference a number, a cell reference, or a formula with a numeric value, and then click OK again Integer Constraint Cell Reference Must Include Only By Changing Cells: This message appears in the Add/Change Constraint dialog box if you click Int in the operator box, but the cells referenced in the Cell Reference box are not changing cells.

Summary

Having looked at the Shape, Rectangle, and Square implementation, you might define an interface (named IShape) as follows: interface IShape { double CalculateArea(); double Width { get; set; } } For the IShape declaration, you might even add a Length property, but the overall idea of the IShape interface is wrong When you think of a shape, do you think in terms of length and width Probably not Rather, you think in terms of area, perimeter, and other features that are common to all shapes Length and width are not common to all shapes A circle has a radius or diameter; a triangle has base width, height, and triangle peak offset The point is that the idea of a shape is not the idea of a rectangle or a square.

This long chapter was well worth the effort when you consider how much theory you ve learned and applied to the BalloonShop project! In this chapter, you accomplished the following: You created the Department table and populated it with data. You added a stored procedure to the database and added code to access this stored procedure from the middle tier using a special data access class. You added a number of configuration options to web.config, such as the database connection string, to make things easier if you need to change these options. You wrote error-handling and reporting code to keep the administrator notified of any errors that happen to the web site. You added the DepartmentsList Web User Control to the site. In the next chapter, you ll continue building the site to include even more exciting functionality!

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