Interaction Design and Prototyping in C#

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Be Proactive Not Reactive
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If certain web sections need to list large numbers of products, it s useful to let the visitor browse them page by page, with a predefined (or configurable by the visitor) number of products per page. Depending on the tier on your architecture where paging is performed, there are three main ways to implement paging: Paging at the data tier level: In this case, the database returns only the page of products needed by the presentation tier. Paging at the business tier level: The business tier requests the complete page of products from the database, performs filtering, and returns back to the presentation tier only the page of products that needs to be displayed. Paging at the presentation tier level: In this scenario, the presentation tier receives the complete list of products and extracts the page that needs to be displayed for the visitor. Paging at the business tier and presentation tier levels has potential performance problems, especially when dealing with large result sets, because they imply transferring unnecessarily large quantities of data from the database to the presentation tier. Additional data also needs to be stored on the server s memory, unnecessarily consuming server resources. In our web site, we ll implement paging at the data tier level, not only because of its better performance, but also because it allows you to learn some tricks about database programming that you ll find useful when developing your web sites. To implement paging at the data tier level, we need to find how to build a SELECT query that returns just a portion of records (products) from a larger set, and each database language seems to have different ways for doing this. To achieve this functionality in PostgreSQL, you need to use the LIMIT and OFFSET keywords together with the SELECT statement: OFFSET specifies how many records from the original rowset to skip. So if you want to retrieve the second page of products in a catalog that has four products per page, you would need to specify OFFSET 4. A query without an offset is the same as a query with OFFSET 0. LIMIT specifies the maximum number of rows to return. When using OFFSET and LIMIT, it s highly recommended to also use ORDER BY. Without this clause, PostgreSQL doesn t guarantee the order in which the results are returned, so, theoretically, different requests for a certain page of products could deliver different results. The
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The SBSAnswerFile.xml le that is generated has the administrative pass-
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13 Web Parts
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Using Master Pages, Themes, and Caching
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decision here! Using exception handling in your code is straightforward and allows you to write code that s easy to implement, easy to read, and easy to maintain. In addition, exception handling allows you to write robust code that s capable of recovering from any application situation. Used correctly, exception handling can prevent application crashes and keep your users happy.
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for ( i = 2; i <= num / 2; i++ ) { j = i + i; while ( j <= num ) { meetsCriteria[ j ] = False; j = j + i; } } for ( i = 1; i <= num; i++ ) { if ( meetsCriteria[ i ] ) { System.out.println ( i + " meets criteria." ); } }
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If you have customizations in your legacy SBS GPOs, you ll want to save them to
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[ServiceContract] public interface ISalaryService { [OperationContract] [FaultContract(typeof(SalaryCalculationFault))] decimal GetWeeklySalary(string employeeId, int weeks); } [ExceptionShielding("SalaryServicePolicy")] public class SalaryService : ISalaryService { public decimal GetWeeklySalary(string employeeId, int weeks) { SalaryCalculator calc = new SalaryCalculator(); return calc.GetWeeklySalary(employeeId, weeks); } }
SELECT * FROM dbo.EmpYearCustCnt(3) AS T;
In reality, the Validation block validation attributes are data annotation attributes, and can be used (with some limitations) whenever you can use data annotations attributes for example, with ASP.NET Dynamic Data applications. The main difference is that the Validation block attribute validation occurs only on the server, and not on the client. Also keep in mind that, while DataAnnotations supports most of the Validation block attributes, not all of the validation attributes provided with the Validation block are supported by the built-in .NET validation mechanism. For more information, see the documentation installed with Enterprise Library, and the topic System.Component Model.DataAnnotations Namespace at componentmodel.dataannotations.aspx. Self-validation might sound as though you should be congratulating yourself on your attractiveness and wisdom, and your status as fine and upstanding citizen. However, in Enterprise Library terms, self-validation is concerned with the use of classes that contain their own validation logic. For example, a class that stores spare parts for aircraft might contain a function that checks if the part ID matches a specific format containing letters and numbers. You add the HasSelfValidation attribute to the class, add the SelfValidation attribute to any validation functions it contains, and optionally add attributes for the built-in Validation block validators to any relevant properties. Then you can validate an instance of the class using the Validation block. The block will execute the self-validation method. Self-validation cannot be used with the UI validation integration features for Windows Forms, WPF, or ASP.NET. Self-validation is typically used where the validation rule you want to apply involves values from different parts of your class or values that are not publicly exposed by the class, or when the validation scenario requires complex rules that even a combination of composed validators cannot achieve. For example, you may want to check if the sum of the number of products on order and the number already in stock is less than a certain value before allowing a user to order more. The following extract from one of the examples you ll see later in this chapter shows how self-validation can be used in this case.
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You could change the security settings and find that the computer has been rendered inaccessible on the network, or that security has been changed to make the computer less secure than is required. If a rollback template was made before the template was applied, you can roll the system back to a previous security state. If you need to recover Registry and file system permissions to an installation state, you can do so by applying one of the default installation templates. If this is not necessary, simply apply the rollback template. In this exercise, you restore security configuration settings by applying a rollback template. 1. Open the Security Configuration Management console created in Exercise 1. 2. Right-click Security Configuration And Analysis and select Import Template. 3. In the Import Template dialog box, shown in Figure 11-8, select the Test1rollback.inf template. 4. Select the Clear This Database Before Importing check box, and click Open.
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