How to compare previous record column value with current record column value in c# linq

compare previous record column value with current record column value in c# linq

my linq query is as below :

 var list = (from v in db.VehicleLocation
                            where v.VehicleId == vehicleId
                            select new VehicleLocationModel
                            {
                                Id = v.Id,
                                Location = v.Location,
                                DateTimestamp = v.DateTimestamp,
                                DiffTimestamp = v.DateTimestamp - previoustimestamp
                            }).OrderBy(x => x.DateTimestamp).ToList();

please help me...