how to get the max value from the linq statement, Please help

Hi

how can I make the following linq statement to get maximum value of reading for the year and month and depot, Any help would be very appreciated

public long GetMaxMeterReading(int depotno, int year, int month)   // 
        {
            long maxRead = (from d in ctx.goMeterReading
                            where d.DepotNo == depotno && d.ReadingYear == year && d.ReadingMonth == month
                            select d.Reading).SingleOrDefault();
            return maxRead;
        }

Regards

Pol