Set the sorting properties of gridview true but still columns are not becoming links

I have to do a sorting on headers of the gridv开发者_StackOverflowiew.

i have set the sorting property to true and also implemented the onsorting event.

But my headers are not coming up as links,what could be the reason?

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Maybe your columns content is not sortable, for instance you have images. For that as a trick you can associate each image an index and bound the grid column to the index, rather than image.