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ASP .NET uses a polling model for SQL Server 2000 and SQL Server 7. Older versions of SQL Server and other databases aren t supported (although third parties can implement their own solutions by creating a custom dependency class). With the polling model, ASP .NET keeps a connection open to the database and checks periodically whether a table has been updated. The effect of tying up one connection in this way isn t terribly significant, but the extra database work involved with polling does add some database overhead. For the polling model to be effective, the polling process needs to be quicker and lighter than the original query that extracts the data. You must take several steps to enable notification with SQL Server 2000. Here s an overview of the process: 1. The first step is to determine which tables need notification support. 2. Next, use the aspnet_regsql.exe command-line utility to create the notification tables for your database. 3. Then, you need to register each table that requires notification support. You also use the aspnet_regsql.exe command for this step. 4. Finally, you enable ASP.NET polling through a web.config file. You re now ready to create SqlCacheDependency objects. The following sections describe these steps.

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Before you can use SQL Server cache invalidation, you need to enable notifications for the database. This task is performed with the aspnet_regsql.exe command-line utility, which is located in the c:\[WinDir]\Microsoft.NET\Framework\[Version] directory. To enable notifications, you need to use the -ed command-line switch. You also need to identify the server (use -E for a trusted connection, and -S to choose a server other than the current computer) and the database (use -d). Here s an example that enables notifications for the standard AspNet database on the current server:

When you take this step, a new table named SqlCacheTablesForChangeNotification is added to the database named AspNet (which must already exist). The SqlCacheTablesForChangeNotification table has three columns: tableName, notificationCreated, and changeId. This table is used to track changes. Essentially, when a change takes place, SQL Server writes a record to this table. ASP.NET s polling service queries this table.

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23 Sep 2015 ... Step 2: Get the first page of the PDF . Step 3: Load the image from file and set it as the PDF background. Step 4: Save the document to file. Figure 1: Watermark . Part 2: Add Text Watermark . Step 1: Create a new instance of PDF document and load the document from file. Step 2: Get the first page of the PDF .

An interaction is a generalization for a type of interaction diagram. UML 2.0 has four kinds of interaction diagrams: timing diagrams, sequence diagrams, interaction overview diagrams, and communication diagrams. We discuss timing diagrams later in this appendix.

This design achieves a number of benefits: Because the change notification table is much smaller than the table with the cached data, it s much faster to query. Because the change notification table isn t used for other tasks, reading these records won t risk locking and concurrency issues. Because multiple tables in the same database will use the same notification table, you can monitor several tables at once without increasing the polling overhead. Figure 26-10 shows an overview of how SQL Server 2000 cache invalidation works.

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End Get Set(value As Decimal) _TaxRate = value End Set End Property End Class You can now get or set the tax rate information directly from the class, without needing to create an object first: ' Change the TaxRate. This will affect all TotalPrice calculations for any ' TaxableProduct object. TaxableProduct.TaxRate = 1.24D Shared data isn t tied to the lifetime of an object. In fact, it s available throughout the life of the entire application. This means shared members are the closest thing .NET programmers have to global data. A shared member can t access an instance member. To access a nonshared member, it needs an actual instance of your object.

You know by now that sequence diagrams are a rather important building block in ICONIX Process. The basic notation for sequence diagrams hasn t changed in UML 2.0; however, some new elements have been introduced, including fragments, gates, states, and message endpoints. These new elements collectively make it easier to draw structured control constructs on sequence diagrams (see Figure A-8).

Objects can be converted with the same syntax that s used for simple data types. However, an object can be converted only into three things: itself, an interface that it supports, or a base class from which it inherits. This process is rarely referred to as conversion, because it doesn t actually alter the object. Instead, it changes the way your code sees the object and it thereby changes what your code can and cannot do with the object. For example, you could cast a TaxableProduct object to a Product object. This operation is allowed because TaxableProduct derives from Product and, thus, every TaxableProduct object is a genuine Product object. Dim myTaxableProduct As New TaxableProduct() Dim myProduct As Product myProduct = myTaxableProduct When you perform this operation, you don t actually change the TaxableProduct object. The same object remains floating as a blob of binary data somewhere in memory. What you change is the way you access that object. From this point on, when you use the myProduct variable, you re treating the TaxableProduct as an ordinary Product. In other words, you re only able to access a subset of its features those methods and properties

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