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I have to retrieve documenttype values based on customerId using linq.how to do that?. 
  List<DBLayer.Models.NCBAccountDocument> basicdetails = (from records in db.NCBAccountDocuments
                                                                    where records.CustomerReferenceNo == CustomerId
                                                                    select  records).ToList();
I done like that ,but it is retrieving all column values.I need only one column value .please help me