A 16-element byte array.
You can use the byte array returned by this method to round-trip a Guid value by calling the Guid.#ctor(Byte[]) constructor.
Note that the order of bytes in the returned byte array is different from the string representation of a Guid value. The order of the beginning four-byte group and the next two two-byte groups is reversed, whereas the order of the last two-byte group and the closing six-byte group is the same. The example provides an illustration.