/// An unknown, invalid, or unsupported option or level was specified in a getsockopt or setsockopt call.

        Native.setsockopt(socketPtr, Native.SocketOptionLevel.Socket, Native.SocketOptionName.ReceiveTimeout, ref optval, optlen);

    public static extern int setsockopt(IntPtr s, SocketOptionLevel level, SocketOptionName optname, ref int optval, int optlen);

Declare Function setsockopt Lib "ws2_32.dll" (TODO) As TODO

        Native.setsockopt(socketPtr, Native.SocketOptionLevel.Socket, Native.SocketOptionName.ReceiveTimeout, ref optval, optlen);