This is almost certainly much slower than any other version given here, but it was fun to write.

static bool ByteArrayEquals(byte[] a1, byte[] a2) 
{
    return a1.Zip(a2, (l, r) => l == r).All(x => x);
}l

This is almost certainly much slower than any other version given here, but it was fun to write.

static bool ByteArrayEquals(byte[] a1, byte[] a2) 
{
    return a1.Zip(a2, (l, r) => l == r).All(x => x);
}