Problem reading vector<CString> from file.

I have created a class containing vector<CString> data member.
class BillSlip
{
private:
  
     int ItemNameIndex;
     vector<double> Weight,Fine,Tch,Qty,Rate,Lab;
     vector<CString> ItemName;
     CString CustomerName;
     char BillNumber[100],Date[20];
     double Material_carry,Money_carry;
     double Material_paid,Money_paid;
     double Material_carry_left,Money_carry_left;
     double Material_debit,Money_debit;
public:
    /*member functions are also there*/
};

I write the file in the following way:
 fstream BillSlipFile;
BillSlip BSlip;
                
BillSlipFile.open("c:\\BSlipRec.txt",ios::out|ios::binary|ios::app);
        BillSlipFile.write((char*)&BSlip,sizeof(BillSlip));
        BillSlipFile.close();

and read the file in the following way:

        BillSlipFile.open("c:\\BSlipRec.txt",ios::in|ios::binary|ios::app);
    BillSlipFile.read((char*)&BSlip,sizeof(BillSlip));
    MessageBox(BSlip.GetCustomerName());
    while(!BillSlipFile.eof())
    {
        BillSlipFile.read((char*)&BSlip,sizeof(BillSlip));
        MessageBox(BSlip.GetCustomerName());
    }
    BillSlipFile.close();

during the read operation I getting

"Unhandled exception at 0x004e774f in billingSystem.exe: 0xC0000005: Access
violation reading location 0xcdcdcdcd."

and the debugger is pointing to

IAtlStringMgr* pNewStringMgr = pData->pStringMgr->Clone();
in static CStringData* __cdecl CloneData( __in CStringData* pData ) in
atlsimpstr.h

call stack:

 
    billingSystem.exe!ATL::CSimpleStringT<char,0>::CSimpleStringT<char,0>(const
ATL::CSimpleStringT<char,0> &
strSrc="????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????") Line 234 + 0x9 bytes C++
 
    billingSystem.exe!ATL::CStringT<char,StrTraitMFC<char,ATL::ChTraitsCRT<char>

ATL::CStringT<char,StrTraitMFC<char,ATL::ChTraitsCRT<char> > > &
strSrc="????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????") Line 1038 C++
  billingSystem.exe!BillSlip::GetCustomerName() Line 52 + 0x11 bytes C++
  billingSystem.exe!BillDialog::ShowRecord() Line 25 + 0x19 bytes C++
  billingSystem.exe!_AfxDispatchCmdMsg(CCmdTarget * pTarget=0x0012f3cc,
unsigned int nID=0x000003f4, int nCode=0x00000000, void (void)*
pfn=0x004c39ba, void * pExtra=0x00000000, unsigned int nSig=0x00000038,
AFX_CMDHANDLERINFO * pHandlerInfo=0x00000000) Line 82 C++
  billingSystem.exe!CCmdTarget::OnCmdMsg(unsigned int nID=0x000003f4, int
nCode=0x00000000, void * pExtra=0x00000000, AFX_CMDHANDLERINFO *
pHandlerInfo=0x00000000) Line 381 + 0x27 bytes C++
  billingSystem.exe!CDialog::OnCmdMsg(unsigned int nID=0x000003f4, int
nCode=0x00000000, void * pExtra=0x00000000, AFX_CMDHANDLERINFO *
pHandlerInfo=0x00000000) Line 85 + 0x18 bytes C++
  billingSystem.exe!CWnd::OnCommand(unsigned int wParam=0x000003f4, long
lParam=0x00020654) Line 2300 C++
  billingSystem.exe!CWnd::OnWndMsg(unsigned int message=0x00000111, unsigned
int wParam=0x000003f4, long lParam=0x00020654, long * pResult=0x0012ede4)
Line 1755 + 0x1e bytes C++
  billingSystem.exe!CWnd::WindowProc(unsigned int message=0x00000111,
unsigned int wParam=0x000003f4, long lParam=0x00020654) Line 1741 + 0x20
bytes C++
  billingSystem.exe!AfxCallWndProc(CWnd * pWnd=0x0012f3cc, HWND__ *
hWnd=0x000e02e6, unsigned int nMsg=0x00000111, unsigned int
wParam=0x000003f4, long lParam=0x00020654) Line 240 + 0x1c bytes C++
  billingSystem.exe!AfxWndProc(HWND__ * hWnd=0x000e02e6, unsigned int
nMsg=0x00000111, unsigned int wParam=0x000003f4, long lParam=0x00020654)
Line 389 C++
  user32.dll!77d48709()
  [Frames below may be incorrect and/or missing, no symbols loaded for
user32.dll]
  user32.dll!77d487eb()
  user32.dll!77d487ff()
  user32.dll!77d70494()
  user32.dll!77d4b743()
  user32.dll!77d4b7ab()
  comctl32.dll!773f6ff6()
  comctl32.dll!773f70d8()
  comctl32.dll!773f93dd()
  billingSystem.exe!AfxGetMainWnd() Line 34 + 0x13 bytes C++
  billingSystem.exe!CWinThread::ProcessMessageFilter(int code=0x00000000,
tagMSG * lpMsg=0x0012f0f0) Line 850 + 0x5 bytes C++
  billingSystem.exe!_AfxMsgFilterHook(int code=0x77d48709, unsigned int
wParam=0x00020654, long lParam=0x00000202) Line 795 C++
  0012f06c()
  user32.dll!77d48709()
  user32.dll!77d487eb()
  user32.dll!77d4ecd2()
  user32.dll!77d70494()
  user32.dll!77d489a5()
  user32.dll!77d553a0()
  user32.dll!77d70494()
  user32.dll!77d489e8()
  user32.dll!77d6e819()
  user32.dll!77d65ce2()
  billingSystem.exe!CWnd::IsDialogMessageA(tagMSG * lpMsg=0x001558d0) Line
198 C++
  billingSystem.exe!CWnd::PreTranslateInput(tagMSG * lpMsg=0x001558d0) Line
4268 C++
  billingSystem.exe!CDialog::PreTranslateMessage(tagMSG * pMsg=0x001558d0)
Line 80 C++
  billingSystem.exe!CWnd::WalkPreTranslateTree(HWND__ * hWndStop=0x000e02e6,
tagMSG * pMsg=0x001558d0) Line 2882 + 0x14 bytes C++
  billingSystem.exe!AfxInternalPreTranslateMessage(tagMSG * pMsg=0x001558d0)
 Line 233 + 0x12 bytes C++
  billingSystem.exe!CWinThread::PreTranslateMessage(tagMSG *
pMsg=0x001558d0) Line 773 + 0x9 bytes C++
  billingSystem.exe!AfxPreTranslateMessage(tagMSG * pMsg=0x001558d0) Line
252 + 0x11 bytes C++
  billingSystem.exe!AfxInternalPumpMessage() Line 178 + 0x18 bytes C++
  billingSystem.exe!CWinThread::PumpMessage() Line 896 C++
  billingSystem.exe!AfxPumpMessage() Line 190 + 0xd bytes C++
  billingSystem.exe!CWnd::RunModalLoop(unsigned long dwFlags=0x00000004)
Line 4322 + 0x5 bytes C++
  billingSystem.exe!CDialog::DoModal() Line 587 + 0xc bytes C++
  billingSystem.exe!BillingApp::InitInstance() Line 423 C++
  billingSystem.exe!AfxWinMain(HINSTANCE__ * hInstance=0x00400000,
HINSTANCE__ * hPrevInstance=0x00000000, char * lpCmdLine=0x00151f4d, int
nCmdShow=0x00000001) Line 37 + 0xd bytes C++
  billingSystem.exe!WinMain(HINSTANCE__ * hInstance=0x00400000, HINSTANCE__
* hPrevInstance=0x00000000, char * lpCmdLine=0x00151f4d, int
nCmdShow=0x00000001) Line 33 C++
  billingSystem.exe!__tmainCRTStartup() Line 324 + 0x35 bytes C
  billingSystem.exe!WinMainCRTStartup() Line 196 C
  kernel32.dll!7c816d4f()
  kernel32.dll!7c8399f3()

Please Help me.