Filtering Data Using ASP.NET 4's QueryExtender Control

[EDN Admin]

One of the new controls available with ASP.NET 4 is the QueryExtender control. The QueryExtender is designed to simplify filtering data returned from a LinqDataSource
or EntityDataSource by decoupling the filtering logic from the data source control. Using the QueryExtender is easy - simply add a QueryExtender to the
page, specify what data source control it applies to, and then define the filtering criteria. For example, when displaying product information on a web
page you could use the QueryExtender control and a few lines of markup to display only those products that are not within a certain price range and whose name or
category starts with a user-specified search string.

Filtering the data returned by a LinqDataSource or EntityDataSource control is certainly possible without the QueryExtender; both the LinqDataSource and EntityDataSource
controls have a

Where

property that can be used to specify filtering criteria. What the QueryExtender offers is a simpler means by which to filter data.
This article includes a number of demos (which can be downloaded at the end of this article) that showcase the QueryExtenders ease of use and its powerful filtering
capabilities. Read on to learn more!

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