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This allows a team of developers to add markers throughout the entire code base, indicating what is done and not done. That way, you will not forget to do certain tasks. Some other identifiers that you can use are HACK to identify some code that is not correct, but hacked in so that it works, and UNDONE. If you happen to be using a Visual Studio edition other than Express, you can define your own comment identifiers. For more information, see the MSDN article Visual Studio How to: Create Custom Comment Tokens (http://msdn2.microsoft.com/en-US/library/ekwz6akh(VS.80).aspx).

Now, at the final bit of this chapter, you complete the last piece of error-handling functionality for BalloonShop. At this point, the single piece of error handling that you ve implemented is in the data access code. The data access code can t know if an error is serious or if it can simply be ignored, so the only purposes are to make sure the database connection is closed properly and to report the error to the administrator. The exception is rethrown, and it s up to the upper layers of the architecture to decide what to do next with the exception. The problem is, if the error isn t properly handled anywhere, it generates an ugly error message that your visitors will see you don t want this to happen. In the next exercise you will Add a custom error page to your site that your visitor will see in case an unhandled error happens. That page will politely ask the visitor to come back later. Report the error once again, so the administrator knows that this serious error gets to the visitor and needs to be taken care of as soon as possible. Adding the custom error page is a very simple task, consisting of building a simple Web Form and configuring it as the default error page in web.config. Reporting unhandled errors is equally simple, by using a class named the Global Application Class. Follow the steps in the exercise to apply all this in practice.

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The Solver Parameters dialog box s most common error messages include the following: Set Target Cell Contents Must Be a Formula: This message appears because the contents of the Set Target Cell box refer to a cell that doesn t contain a formula To correct this problem, make sure that the Solver Parameter s dialog box s Set Target Cell box contains a reference to a cell that contains a formula Problem to Solve Not Specified: This message appears if you click the Solve button and you have not specified any adjustable cells in the By Changing Cells box, or if you have not specified a cell reference in the Set Target Cell box nor any constraints To correct this problem, make sure that you have set, as a minimum, a cell reference in the Set Target Cell and By Changing Cells boxes.

In the example, Rectangle is instantiated, and the properties Width and Length are assigned values of 20 and 30, respectively When the CalculateArea() method is called, the found area is assigned to the variable area The source code does what we expect It instantiates a rectangle, assigns the rectangle dimensions, and calculates the area of the rectangle But a Rectangle type can also be a Square type Consider the following modified source code, which makes a Square out of a Rectangle Rectangle rectangle = new Rectangle(); rectangleWidth = 20; rectangleLength = 30; Square square = rectangle; double area = squareCalculateArea(); ConsoleWriteLine("Square Area is " + squareCalculateArea() + " Rectangle Area is " + rectangleCalculateArea()); In the example, the variable rectangle is of type Rectangle.

1. Right-click the project entry in Solution Explorer and then select Add New Item. 2. Choose the Global Application Class template and click Add. 3. Modify Application_Error like this:

void Application_Error(Object sender, EventArgs e) { // Log all unhandled errors Utilities.LogError(Server.GetLastError()); } 4. In Solution Explorer, double-click web.config and add the following element as a child of the <system.web> element: <customErrors mode="RemoteOnly" defaultRedirect="Oops.aspx" />

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