Čitanje binarnog fajla

Code:
for (int j = 0; j < bytes.Length; j++)
                            {
                                var f1 = bytes[j];
                                var f2 = bytes[j + 1];
                                var f3 = bytes[j + 2];
                                var f4 = bytes[j + 3];
                                var f5 = bytes[j + 4];                              
                                var f6 = bytes[j + 5];     ------- ovde dobijam error

}