I am facing a similar problem to this question has anybody found a solution to it
the sample application here is also not filtering
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The application you have referred uses hidden fields that are updated through js on
DataBoundevent of the grid likeHowever, if you have a look at keys that grid posts when filtering, it looks like

so, in that application if you are trying to access filtering info in _index method which provides data to grid ajaxically, you have to change parameter name from filterBy to filter like