How to display the values from structures in C# from C++

abc.h file

typedef struct sp_BankNoteTypeList
{
    int cim_usNumOfNoteTypes;
    struct sp_notetype
    {
            USHORT cim_usNoteID;
            CHAR   cim_cCurrencyID[3];
            ULONG  cim_ulValues;
            bool   cim_bConfigured;
    }SP_CIMNOTETYPE[12];
}SP_CIMNOTETYPELIST,*SP_LPCIMNOTETYPELIST;


BNA_API int BanknoteType(SP_CIMNOTETYPELIST *sp_BankNoteType);

abc.cpp (DLL File)

int BanknoteType(SP_CIMNOTETYPELIST *sp_BankNoteType)
{
    LPWFSCIMNOTETYPE    fw_notetypedata;
    LPWFSCIMNOTETYPELIST    lpNoteTypeList;   //output param
    hResult = WFSGetInfo(hService, WFS_INF_CIM_BANKNOTE_TYPES, (LPVOID)NULL, 400000, &res);
    lpNoteTypeList=(LPWFSCIMNOTETYPELIST)res->lpBuffer;
    if(hResult!=0)
    {
            return (int)hResult;
    }
    sp_BankNoteType->cim_usNumOfNoteTypes = lpNoteTypeList->usNumOfNoteTypes;
    for(int i=0;i<lpNoteTypeList->usNumOfNoteTypes;i++)
    {
        sp_BankNoteType->SP_CIMNOTETYPE[i].cim_usNoteID = lpNoteTypeList->lppNoteTypes[i]->usNoteID;
        sp_BankNoteType->SP_CIMNOTETYPE[i].cim_ulValues = lpNoteTypeList->lppNoteTypes[i]->ulValues;
        sp_BankNoteType->SP_CIMNOTETYPE[i].cim_bConfigured = lpNoteTypeList->lppNoteTypes[i]->bConfigured;
        sp_BankNoteType->SP_CIMNOTETYPE[i].cim_cCurrencyID[0] = lpNoteTypeList->lppNoteTypes[i]->cCurrencyID[0];
        sp_BankNoteType->SP_CIMNOTETYPE[i].cim_cCurrencyID[1] = lpNoteTypeList->lppNoteTypes[i]->cCurrencyID[1];
        sp_BankNoteType->SP_CIMNOTETYPE[i].cim_cCurrencyID[2] = lpNoteTypeList->lppNoteTypes[i]->cCurrencyID[2];        

    } 
    return (int)hResult;
}

Structure :-

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        public struct sp_notetype
        {
            public ushort cim_usNoteID;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 3)]
            public char[] cim_cCurrencyID;
            public ulong cim_ulValues;
            public bool cim_bConfigured;
        };

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        public struct sp_BankNoteTypeList
        { 
            public int cim_usNumOfNoteTypes;
            [MarshalAs(UnmanagedType.ByValArray, SizeConst = 12)]
            public sp_notetype[] SP_CIMNOTETYPE;    
        }; 
        public sp_notetype[] SP_CIMNOTETYPE;
        public sp_BankNoteTypeList SP_CIMNOTETYPELIST;

Function calling:-

[DllImport(@"abc.dll")]
        public static extern int BanknoteType(out sp_BankNoteTypeList SP_CIMNOTETYPELIST);



     public string BNA_BankNoteType(out int[] NoteID,out string[]CurrencyID,out string[] Values,out bool[] Configured)
    {
        NoteID = new int[12];
        CurrencyID = new string[12];
        Values = new string[12];
        Configured = new bool[12];
        try
        {
             trace.WriteToTrace(" Entered in BNA_BankNoteType ", 1);
             hResult = BanknoteType(out SP_CIMNOTETYPELIST);
            for (int i = 0; i < 12; i++)
            {
                NoteID[i] = (SP_CIMNOTETYPELIST.SP_CIMNOTETYPE[i].cim_usNoteID);
                CurrencyID[i] = (SP_CIMNOTETYPELIST.SP_CIMNOTETYPE[i].cim_cCurrencyID[0]).ToString() + (SP_CIMNOTETYPELIST.SP_CIMNOTETYPE[i].cim_cCurrencyID[1]).ToString() + (SP_CIMNOTETYPELIST.SP_CIMNOTETYPE[i].cim_cCurrencyID[2]).ToString();
                Values[i] = (SP_CIMNOTETYPELIST.SP_CIMNOTETYPE[i].cim_ulValues).ToString();
                Configured[i] = (SP_CIMNOTETYPELIST.SP_CIMNOTETYPE[i].cim_bConfigured);

            }

            return DicErrorCode(hResult.ToString());
        }
        catch (Exception ex)
        {

            return "FATAL_ERROR";
        }

when I try calling them in C# I get garbage value in C#. While I debug them I find proper storing the values. Any help as to how the values must be passed would be very useful.. Thanks in advance.