Equivalent of C++ typedef struct to C#

I'm working on a project that need to communicate to a DLL. The SDK provided have a demo project in C++ and it retreive the data from the DLL using the above typedef struct and it's working well but I have to do the same thing but in C# and I tried to create a similar struct but when i call the DLL my struct is filled in a different order.

typedef struct tagTrackIRData

{

    unsigned short wNPStatus;

    unsigned short wPFrameSignature;

    unsigned long  dwNPIOData;



    float fNPRoll;

    float fNPPitch;

    float fNPYaw;

    float fNPX;

    float fNPY;

    float fNPZ;

    float fNPRawX;

    float fNPRawY;

    float fNPRawZ;

    float fNPDeltaX;

    float fNPDeltaY;

    float fNPDeltaZ;

    float fNPSmoothX;

    float fNPSmoothY;

    float fNPSmoothZ;

} TRACKIRDATA, *LPTRACKIRDATA;

The problem is that I received in C# the struct above but I'm not able to assign it in the same struct format in C# (The struct is from a c++ dll and my program calling it is in C#). I tried to use this kind of converted struct in C# but the data is not going into the right variable name probably due to the missing *LPTRACKIRDATA.

struct TRACKIRDATA

{

    public ushort wNPStatus;

    public ushort wPFrameSignature;

    public ulong dwNPIOData;



    public float fNPRoll;

    public float fNPPitch;

    public float fNPYaw;

    public float fNPX;

    public float fNPY;

    public float fNPZ;

    public float fNPRawX;

    public float fNPRawY;

    public float fNPRawZ;

    public float fNPDeltaX;

    public float fNPDeltaY;

    public float fNPDeltaZ;

    public float fNPSmoothX;

    public float fNPSmoothY;

    public float fNPSmoothZ;

}

I'm calling the DLL in C# using this code:

TRACKIRDATA tid;

NPRESULT gdRes = getData(&tid);

Where getData() is

private delegate NPRESULT NP_GetData(TRACKIRDATA* data);

getData = (NP_GetData)Marshal.GetDelegateForFunctionPointer(procAddrNP_GetData, typeof(NP_GetData));

Thanks @Asik you were right! The problem was caused by the wrong type equivalent of dwNPIOData because the usigned long in C++ is 32Bits and in C# it's a 64bits size. The solution was to use the type uint32 in C#

public uint dwNPIOData;