score:3

select new creates instances of a new anonymous type. The query creates a list of these and then you try to cast that to IList<BC_FeedbackBy>. Create new instances of BC_FeedbackBy in the query instead.

Something like

select new BC_FeedbackBy() 
{
   feedbackId =s.FeedbackById ,
   feedbackName=s.FeedbackBy  ,
})

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