I want to change the display value i.e. html of group key. How to do that?
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You cannot directly change the display text of the group key.A workaround for this can be , setting mapped data, where the grouping keys text is changed.
You can use the dataBound event, where you can swap the original data with the mapped.I made a sample, based on your requirement.
Please, take a look at the sample and let me know if you have any questions.