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) So, although the year parameter could accept any value within the minimum and maximum range of a signed 16-bit integer data type, the acceptable range is artificially constrained to a linear range of values (1582 through 3000) in the overall range of the data type BVA is especially useful at methodically analyzing two types of boundary values commonly found in software: fixed-constant values and fixed-variable values Fixed-constant boundaries are mathematical constants, or real numbers that are significantly interesting and remain constant during run time and typically cannot be changed by a user For example, in the Next Date program 1582 and 3000 are predefined constant values that specify an allowable range for the year input variable Another predefined constant value in the Next Date program is the maximum number of characters a user can enter in the Year text box.

Stored procedures are a good way to improve the performance of an enterprise application. The stored procedure can encapsulate database work that is more easily performed by the database, rather than your application (through JDBC).

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The event pattern also requires that the delegate definition and the callback method name the EventArgs-derived parameter e . The only reason for this is to add additional consistency to the pattern, making it easier for developers to learn and implement the pattern . Tools that spit out source code (such as Microsoft Visual Studio) also know to call the parameter e . Finally, the event pattern requires all event handlers to have a return type of void . This is necessary because raising an event might call several callback methods, and there is no way to get the return values from all of them . Having a return type of void doesn t allow the callbacks to return a value . Unfortunately, there are some event handlers in the FCL, such as ResolveEventHandler, that did not follow Microsoft s own prescribed pattern because it returns an object of type Assembly .

Figure 7-8 shows the results in the Toolbox. You can see that the web server control, LabeledTextBox, has a custom icon.

Adding a custom WebPartManager The next feature we want to implement is a custom WebPartManager to handle all our web part authorization checks. The code we ll be implementing to perform authorization checks is similar to the code we saw earlier in the chapter when we discussed using AuthorizationFilter strings to store authentication information. In the section on web part authorization I mentioned that it is good for authorization logic to be standard across the entire application. The logic for the authorization checks we ll be performing is all the same checking to find which roles a user is a member of so moving all of the authorization logic for displaying web parts into the web part manager makes sense: single point of implementation, single point of failure! To create our custom WebPartManager, add a class file to the project named PortalWebPartManager.cs by right-clicking on the App_Code folder and choosing Add File. When the file is created ensure that the PortalWebPartManager class inherits from WebPartManger. There are two pieces of code that need to be added to our custom WebPartManager. We need one method that will perform a role-based check for the current user and another method to handle the AuthorizeWebPart events. The code that handles the authorization events will get the AuthorizationFilter string for each web part and then split it up into individual roles. Once we have the individual roles for each web part we can loop through them and check each role to determine whether or not the user has access to that web part. Listings 4.10 and 4.11 contain the code for handling the event and for the helper method which checks the users roles.

Click Start, click All Programs, and select SBS Best Practices Analyzer Tool. The rst time you run the BPA, you ll be asked if you want to check for new versions every time you start it, and you ll be offered an opportunity to check now. Say yes to automatic updates, and do check now even with a fresh download, we still got a newer version after the check. From the Welcome screen shown in Figure 7-19, you can select the options to use for a scan or view a previous scan.

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