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Message: [QUOTE="Sharon, post: 13612845"] Hello Gurus, I have a function that copy data from byte[] to class as follow: public static void CopyByteToHeader(Header target, byte[] source) { ntPtr pHeaderTarget = Marshal.AllocHGlobal(HEADER_SIZE); arshal.Copy(source, 0, pHeaderTarget, HEADER_SIZE); arshal.PtrToStructure(pHeaderTarget, target); } public const int HEADER_SIZE = 9; [StructLayout(LayoutKind.Sequential)] public class Header { [MarshalAs(UnmanagedType.ByValArray, SizeConst = 1)] public byte[] m_type; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)] public byte[] m_lMsgIndex; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)] public byte[] m_lLength; } The function works fine. BUT: This function is executed many times, so it makes a lot of memory copeing. I want to optimize it doing like in C++: Public CPP_CopyByteToHeader(Header* target, byte* source) { target = (Header*)source } This way Iâ€™m avoiding the copy. But is C# I tried: public static void CopyByteToHeader(Header target, byte[] source) { unsafe { fixed (byte* pSource = (byte[])source) { // Now I need the pointer for the target. // But I canâ€™t find how to! } } } As you can see its incomplete. I need to get a pointer to the target. Can anybody show me how can I do the coply like, like itâ€™s done in the C++ above? [/QUOTE]