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SQL cache dependencies are one of the most widely touted new ASP.NET 2.0 features the ability to automatically invalidate a cached data object (such as a DataSet) when the related data is modified in the database. This feature is supported in both SQL Server 2005 and in SQL Server 2000, although the underlying plumbing is quite a bit different. To understand how SQL cache dependencies work, it s important to understand a few flawed solutions that developers have been forced to resort to in the past. One common technique is to use a marker file. With this technique, you add the data object to the cache and set up a file dependency. However, the file you use is empty it s just a marker file that s intended to indicate when the database state changes. Here s how it works. When the user calls a stored procedure that modifies the table you re interested in, your stored procedure removes or modifies the marker file. ASP .NET immediately detects

Figure 2-10. Keeping track of tasks To move to the line of code, double-click the new task entry. Notice that if you remove the comment, the task entry is automatically removed as well. Three token tags are built-in HACK, TODO, and UNDONE. However, you can add more. Simply select Tools Options. In the Options dialog box, navigate to the Environment Task List tab. You ll see a list of comment tokens, which you can modify, remove, and add to. Figure 2-11 shows this window with a new ASP comment token that you could use to keep track of sections of code that have been migrated from classic ASP pages.

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The next step is to add the elements with the information about the DVD inside the <DVD> element. These elements won t have child elements of their own, so you can write them and set their values more efficiently with a single call to the WriteElementString() method. WriteElementString() accepts two arguments: the element name and its value (always as string), as shown here: ... ' Write some simple elements. writer.WriteElementString("Title", "The Matrix") writer.WriteElementString("Director", "Larry Wachowski") writer.WriteElementString("Price", "18.74") ... Next is a child <Starring> element that lists one or more actors. Because this element contains other elements, you need to open it and keep it open with the WriteStartElement() method. Then you can add the contained child elements, as shown here: ... writer.WriteStartElement("Starring") writer.WriteElementString("Star", "Keanu Reeves") writer.WriteElementString("Star", "Laurence Fishburne") ... At this point the code has written all the data for the current DVD. The next step is to close all the opened tags, in reverse order. To do so, you just call the WriteEndElement() method once for each element you ve opened. You don t need to specify the element name when you call WriteEndElement(). Instead, each time you call WriteEndElement() it will automatically write the closing tag for the last opened element. ... ' Close the <Starring> element. writer.WriteEndElement() ' Close the <DVD> element. writer.WriteEndElement() ... Now let s create another <DVD> element using the same approach: ... writer.WriteStartElement("DVD") ' Write a couple of attributes to the <DVD> element. writer.WriteAttributeString("ID", "2") writer.WriteAttributeString("Category", "Drama") ' Write some simple elements. writer.WriteElementString("Title", "Forrest Gump") writer.WriteElementString("Director", "Robert Zemeckis") writer.WriteElementString("Price", "23.99") ' Open the <Starring> element. writer.WriteStartElement("Starring") ' Write two elements. writer.WriteElementString("Star", "Tom Hanks") writer.WriteElementString("Star", "Robin Wright") ' Close the <Starring> element. writer.WriteEndElement()

the file change and removes the corresponding data object This ugly workaround isn t terribly scalable and can introduce concurrency problems if more than one user calls the stored procedure and tries to remove the file at once It also forces you to clutter your stored procedure code, because every stored procedure that modifies the database needs similar file modification logic Having a database interact with the file system is a bad idea from the start, because it adds to the complexity and reduces the security of your overall system Another common approach is to use a custom HTTP handler that removes cached items at your request Once again, this only works if you build the appropriate level of support into the stored procedures that modify the corresponding tables.

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