How to pass a string to C# from VC++

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C#

Hello,

How do I pass a string to C# from VC++ using the function described in
Codeproject[^]

If I use this in VC++:

TCHAR chMyString[256];
varArgs[0].vt = VT_BYREF|VT_BSTR;
varArgs[0].bstrVal = _bstr_t(chMyString);

and this in C#:

public void MyString([In, MarshalAs(UnmanagedType.BStr)] string chMyString)
{
    MessageBox.Show(chMyString); //ALWAYS EMPTY STRING
}

The varArgs[0].bstrVal is not passed to C#. Can someone help me? If there are other ways, please advise me.