byte[] ts = ModelContainer.MyTable.First().MyColumn;
var rows = dbEntities.MyTable.Where(x=>x.MyColumn > ts).ToArray();

    public static class TimestampComparer
    {
        public static int Compare(this byte[] b1, byte[] b2)
        {
            throw new NotImplementedException();
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Database1Entities1 context = new Database1Entities1();

            var ts = context.TestTables.OrderBy(x => x.timestamp).First().timestamp;

            var q = context.TestTables.Where(x=> x.timestamp.Compare(ts) > 0);

        }
    }