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Figure 3-20. Editing the BalloonShop Master Page 5. Now switch again to Design View; you should see something like Figure 3-21. (You may need to reload or refresh the project in order for the BalloonShop image to show up.) 6. Master Pages are not meant to be accessed directly by clients, but to be implemented in Web Forms. You ll use the Master Page you ve just created to establish the template of the Default.aspx Web Form. Because the Default.aspx page that Visual Web Developer created for you was not meant to be used with Master Pages (it contains code that should be inherited from the Master Page), it s easier to delete and re-create the file. Right-click Default.aspx in Solution Explorer and choose Delete. Confirm the deletion.

Figure 4-22. The completed Solver Parameters dialog box for the second online auction problem 27. Click Solve, and then click OK. Compare your results to Figure 4-23.

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Figure 5-4. Exceptions and calling methods that generate exceptions In Figure 5-4, the protected code of action 2 calls a method that has action 2.1, action 2.2, and action 2.4. action 2.2 executes in the context of an exception block, and thus if action 2.2 throws an exception, it will be caught and processed by action 2.3. The catch block containing action 3 is not aware an exception occurred. From the perspective of the called method, action 2.1 and action 2.4 are not protected, but because the called method is called from action 2, which is protected by the catch block containing action 3, action 2.1 and action 2.4 are considered protected. If action 2.1 or action 2.4 had thrown an exception, then the catch block with action 3 would have caught the exception. This example illustrates two things: Exceptions can span method calls. When an exception is thrown, the handler will catch it closest to the place where the exception occurred. An example of how exceptions function is our legal court system. Let s say that you want to slap someone with a lawsuit. If the lawsuit is a civil case, it will be heard by the local court. You cannot bring a civil lawsuit directly to the supreme court level until it has been heard by the lower court levels. If the lawsuit is a criminal case, most likely it will be heard at the state/provincial level first. The local municipality will not hear the case because it is not in the jurisdiction of that court.

Figure 3-21. BalloonShop.master in Design View 7. Right-click the project root in Solution Explorer and select Add New Item. Choose the Web Form template, leave its name as Default.aspx, uncheck Place code in separate file (you don t need a codebehind file for that form), check Select master page, verify that the language is Visual C#, and click Add. When asked for a Master Page file, choose BalloonShop.master and click OK. Your new page will be created with just a few lines of code, all the rest being inherited from the Master Page: <%@ Page Title="" Language="C#" MasterPageFile="~/BalloonShop.master" %> <script runat="server"> </script> <asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server"> </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> </asp:Content> When you switch to Design View, Default.aspx will look like Figure 3-22.

The same behavior occurs with exceptions and exception handlers An exception might be caught and processed by one exception handler, without the exception being processed by a higher-level exception handler This situation is illustrated in Figure 5-3 where an exception was thrown and caught by the IDE An exception that was thrown several method calls deep was caught at the highest level In previous examples, an exception was thrown because the code did something that it was not supposed to do However, you can throw an exception on purpose by using the following syntax: throw new Exception(); When you throw an exception like this, you instantiate a type that is related to the base type Exception Associating the throw keyword with an object creates an exception that can be caught by a higher-level catch block.

Figure 3-22. Editing Default.aspx in Design View 8. Change the title of the page from Untitled Page to BalloonShop: Online Store Demo by editing the code in Source View like this: <%@ Page Title="BalloonShop: Online Store Demo" Language="C#" MasterPageFile="~/BalloonShop.master" %> 9. Press F5 to execute the project. You should get a page similar to the one in Figure 3-23.

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