asp.net - RadGrid Error is neither a DataColumn nor a DataRelation for table DefaultView -


i trying set primary key value datakeyname attribute in radgrid giving me cryptic error "cap_id neither datacolumn nor datarelation table defaultview." indeed primary key of table specify in radgrid. how can solve this?

<telerik:radgrid id="radgrid1" runat="server" allowpaging="true"          allowsorting="true" cellspacing="0" gridlines="none"          datasourceid="sqldatasourcecapabilities" autogeneratecolumns="true"         autogeneratedeletecolumn="true" autogenerateeditcolumn="true"          onpagesizechanged="radgrid1_pagesizechanged"          onitemcommand="processthiscommand">         <clientsettings>             <scrolling allowscroll="true" usestaticheaders="true" />         </clientsettings>         <mastertableview datakeynames="cap_id" datasourceid="sqldatasourcecapabilities">

you must add primary key field of particular table in select query.

you can hide later using visible @ end of column.

<telerik:gridboundcolumn datafield="subject" visible="false">


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