entitydatasource - Ordering Entity datasource wilth Nulls first -

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i have gridview in column has both alphabets , nulls values coming database(oracle). when perform sort operation on column sorting data in ascending null values coming @ last. after analysis came know oracle default sorts data nulls @ end.

is there way can override default behaviour?

i tried setting orderby property of entity data source below.

    <asp:entitydatasource id="griddatasource" runat="server" enabledelete="true" enableupdate="true"             connectionstring="name=hqadataentities" defaultcontainername="hqadataentities" orderby="case              when it.[gnrc_lkup_category] null 0              else 1                   end,it.[gnrc_lkup_category]"             enableflattening="false" enableinsert="true" entitysetname="gen_lookup">

but woking on initial page load, when perform sort clicking grid header not performing sort correctly.


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