pointer in C code implement in C#

//*****************************************************************************
//
// This structure defines the fields in a BOOTP request/reply packet.
//
//*****************************************************************************
typedef struct
{
    //
    // The operation; 1 is a request, 2 is a reply.
    //
    unsigned char ucOp;

    //
    // The hardware type; 1 is Ethernet.
    //
    unsigned char ucHType;

    //
    // The hardware address length; for Ethernet this will be 6, the length of
    // the MAC address.
    //
    unsigned char ucHLen;

    //
    // Hop count, used by gateways for cross-gateway booting.
    //
    unsigned char ucHops;

    //
    // The transaction ID.
    //
    unsigned long ulXID;

    //
    // The number of seconds elapsed since the client started trying to boot.
    //
    unsigned short usSecs;

    //
    // The BOOTP flags.
    //
    unsigned short usFlags;

    //
    // The client's IP address, if it knows it.
    //
    unsigned long ulCIAddr;

    //
    // The client's IP address, as assigned by the BOOTP server.
    //
    unsigned long ulYIAddr;

    //
    // The TFTP server's IP address.
    //
    unsigned long ulSIAddr;

    //
    // The gateway IP address, if booting cross-gateway.
    //
    unsigned long ulGIAddr;

    //
    // The hardware address; for Ethernet this is the MAC address.
    //
    unsigned char pucCHAddr[16];

    //
    // The name, or nickname, of the server that should handle this BOOTP
    // request.
    //
    char pcSName[64];

    //
    // The name of the boot file to be loaded via TFTP.
    //
    char pcFile[128];

    //
    // Optional vendor-specific area; not used for BOOTP.
    //
    unsigned char pucVend[64];
}
tBOOTPPacket;

unsigned char pcPacketData[700];
tBOOTPPacket *pPacket;

pPacket = (tBOOTPPacket *)pcPacketData;