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The priority of an item to be stored in the ASP NET cache can be specified at the time the data is cached (using the Add() or Insert() method) These are the different priority levels, as classified in the CacheItemPriority enumeration: High priority items are the least likely to be removed when memory is low AboveNormal priority items prevail over items with a priority of Normal or less Normal priority items will prevail over BelowNormal and Low priorities The default value for a cached item s priority is Normal BelowNormal priority items use the second lowest priority available Items with this priority set will prevail over only items whose priority is set to Low Low priority items will be the most likely to be removed when memory is low NotRemovable as a priority level for an item means that ASP .

Caution Although XmlDocuments elements are inherited for new child content types, updates to existing

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NET should not remove it from the cache, even if memory is low When you re assigning the priority of an item, you should base the assignment on the resource cost needed to produce the item: the higher the cost, the higher the priority level So, to use the Add() method to add a DataSet object to the ASP NET cache, you might write the method call like this: Dim dt As New DateTime(DateTimeNowYear,12,31) CacheAdd("MembersDataSet", dsMembers, Nothing, _ dt, TimeSpanZero, _ CacheItemPriorityNormal, Nothing) The first and second arguments are the keys by which you reference the cached object and the object to be cached The third argument is null (signifying no dependency) The fourth and fifth parameters are the absolute and sliding expirations Here, we re saying that the cache should expire on the last day of the current year (dt).

Figure 14-10. Showing the table data from the Database Explorer This will then show the actual records from the Orders table of the Northwind database (Figure 14-11).

We want to specify that there is no sliding expiration, so we put TimeSpanZero into the fifth argument The sixth parameter sets the priority to be Normal, using a value from the SystemWebCachingCacheItemPriority enumeration The following example is similar, but it specifies a sliding expiration of 5 minutes instead of an absolute expiration:.

child content types have a quirk. Basically, if a content type is in use in other words, it is deployed to a list or items have been created based on the content type updates to the parent XmlDocuments element are not propagated. To force updates, you can update the child content type manually or ensure that no lists or items currently use the child content type. Of course, I am still a glass is half full kind of guy, so please read on for how you can use this to your advantage.

Cache.Add("MembersDataSet", dsMembers, Nothing, _ DateTime.MaxValue, TimeSpan.FromMinutes(5), _ CacheItemPriority.Normal, Nothing) So, if you want to set no absolute expiration, use DateTime.MaxValue. If you want to specify no sliding expiration, use TimeSpan.Zero. (It s not valid to provide values for both absolute expiration and sliding expiration at the same time; if you do, ASP .NET will throw an exception.) We could add a dependency. In this example, the expiration is also dependent on the modification of a file, friendsreunion.xml: Dim dep As New CacheDependency("C:\\data\\friendsreunion.xml") Cache.Add("MembersDataSet", dsMembers, dep, _ DateTime.MaxValue, TimeSpan.Zero, _ Normal, Nothing); In the next example, the expiration is dependent on the modification of another item in the cache: Dim dependencyKeys() As String = {"MembersChanged"} Dim dependency As new CacheDependency(Nothing, dependencyKeys) Cache.Add("MembersDataSet", dsMembers, dep, _ DateTime.MaxValue, TimeSpan.Zero, _ CacheItemPriority.Normal, Nothing) If you don t want to specify a CacheDependency object for your item, you can pass Nothing to that argument, as in the first example.

Figure 14-11. Viewing the table data To continue with our example, let s update a record to test the SQL Cache. Change the rst record under the ShipName column to read John Doe. Right-click on the newly added text, and choose Execute SQL to update the entry (Figure 14-11).

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