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Sqlcachedependency not invalidating cache
The element's index is used in the logic of the predicate function.(Defined by Enumerable.) methods that implement base methods that contain a parameter for regions, do not pass a value for the parameter.The methods that use the region parameter all supply a default null value.When the page first loads , the DB is queried, the Cache and Grid View is populated.
It also uses a Change Monitor object to monitor the state of the source data (which is a file) on the file system.
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Now, whenever the query output changes, Sql Cache Dependency invalidates the cache.
When the cache is null,the query runs again and binds the grid.
Please realize that, this Query notification using SQLCache Dependency does not refresh the web page.
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The aspx page still needs a postback to reflect the changes. The timer polls at a certain interval & checks if the cache is empty or not.If you choose to participate, the online survey will be presented to you when you leave the Msdn Web site. Performance is the key requirement of any application.What is best practice for invalidating the cache in those cases? Groups the elements of a sequence according to a key selector function.One of important technique which helps in the performance of application is Caching.Caching is the process of storing frequently used data on the server to fulfill subsequent requests.If the cache is empty , it runs the query again , grabs new data , binds the grid & updates the Update Panel. But still it’s better since the DB is not polled, instead the application’s cache object and the Grid View databinding occurs only when data changes.Another thing to keep in mind, since it’s cache , the scope is application.For example, the Memory Cache The following example declares a reference to the default memory cache instance.The cache entry uses a Cache Item Policy object to provide eviction and expiration details for the cache entry.