STATUS_STACK_BUFFER_OVERRUN encountered

Hi I am calling a function from MFC dll in C# application.
This function work with C++ application but when I was calling from C#
application terminates unexpectedly.

can anyone tell me why this happening?

I am pasting my source code here
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C# code
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        private void button1_Click(object sender, EventArgs e)
        {
            string strPassWord = textBox1.Text;
            string strHash = "";
            PasswordHash(strPassWord,ref strHash);
            MessageBox.Show(strHash);
        }

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PasswordHash function in my MFC regular statically linked to MFC dll
C++ code

bool __stdcall PasswordHash(LPCTSTR lpPassword, LPTSTR lpszHash)
{
    AFX_MANAGE_STATE(AfxGetStaticModuleState());
    CString strPassword(lpPassword);
    bool bReturn = false;
    HCRYPTPROV hCryptProv;
    HCRYPTHASH hHash=NULL;
    BYTE pbHash[16];
    DWORD dwHashLen= 16;
    DWORD cbContent= strPassword.GetLength() * sizeof(TCHAR);
    BYTE* pbContent= (BYTE *) strPassword.GetBuffer(cbContent);

    if(CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET))
{
if(CryptCreateHash(hCryptProv,CALG_MD5,0, 0, &hHash))
{
if(CryptHashData(hHash, pbContent, cbContent, 0))
{
if(CryptGetHashParam(hHash, HP_HASHVAL, pbHash, &dwHashLen, 0))
{
LPTSTR lpTmp = lpszHash;
for (int i = 0; i < 16; i++)
{
const size_t nlen = sizeof(pbHash[i])+2;
_stprintf_s(lpTmp,nlen,_T("%02X"),pbHash[i]);
lpTmp += 2;
}
bReturn = true;
}
}
}
}
CryptDestroyHash(hHash);
CryptReleaseContext(hCryptProv, 0);
return bReturn;
}

-----------------

here problem in my for loop

LPTSTR lpTmp = lpszHash;
for (int i = 0; i < 16; i++)
{
        const size_t nlen = sizeof(pbHash[i])+2;
        _stprintf_s(lpTmp,nlen,_T("%02X"),pbHash[i]);
        lpTmp += 2;
}
//Application will terminates when i=13
whats wrong in this loop I also try this with _stprintf (non secure
version) same problem each time only when I am trying to call in C#
application

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Additional Information: The runtime has encountered a fatal error. The
address of the error was at 0x79ee24f1, on thread 0x10c4. The error
code is 0xc0000005. This error may be a bug in the CLR or in the
unsafe or non-verifiable portions of user code. Common sources of this
bug include user marshaling errors for COM-interop or PInvoke, which
may corrupt the stack.

STATUS_STACK_BUFFER_OVERRUN encountered
The thread 'Win32 Thread' (0x1478) has exited with code -1073740791
(0xc0000409).
The thread 'Win32 Thread' (0x854) has exited with code -1073740791
(0xc0000409).
The thread 'Win32 Thread' (0x13e4) has exited with code -1073740791
(0xc0000409).
The program '[6076] CryptClient.exe: Managed' has exited with code
-1073740791 (0xc0000409).
The program '[6076] CryptClient.exe: Native' has exited with code
-1073740791 (0xc0000409).

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Kind Regards