UPDATED:
Starting with version 14.2, GridView provides the built-in Search / Find Panel functionality with the capability to locate it outside grid boundaries. This allows accomplishing a similar task with less effort and does not require so much extra code. See the ASP.NET Data Grid: Enhancements post to learn more about this new functionality.
It's possible to implement a Filter Panel for the ASPxGridView control in the same manner as the XtraGrid's Find Panel is implemented. The main idea is to create a template, and build and apply the ASPxGridView.FilterExpression expression in the ASPxGridView.CustomCallback event handler.
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OBSOLETE - How to implement Filter Panel for ASPxGridView control as XtraGrid's Find Panel
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