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This functionality enables the Grid View control to provide built-in, bi-directional sorting.The following diagram depicts the sorting workflow, including the Grid View's assignment of its properties. NET: Tips, Tutorials, and Code -- Sams Teach Yourself ASP. NET Applications] | [Security] | [Graphics and Charting] | [Working with the File System] | [Utilizing Components] | [Advanced Techniques] | [Miscellaneous Topics] ASP.
NET page very similar to that used for the Data Grid.
Since the Bound Field is the only Grid View field that HTML encodes its data, this hack is only needed for the Bound Field.
All other fields - the Template Field, Check Box Field, Button Field, and so on - will correctly display the up and down arrow images without any extra hacks.
While the Data Grid (and Grid View) offer built-in sorting support, there is no visual feedback as to what column the data is sorted by.
In Part 18 of the An Extensive Examination of the Data Grid Web Control article series, I showed how to dynamically update a sortable Data Grid's header columns so that an up or down arrow image would appear next to the sorted column name depending on whether the column was sorted ascendingly or descendingly (view a live demo).We'll see how to use this custom Bound Field class in the "Using the Custom Grid View Control in an ASP. At this point you may be wondering how the custom Grid View control determines the URLs for the up and down image arrows.