i have the following scenario

I've created MFC Application using Visual Studio 2003, then change the
project settings
to use Managed Extensions as follows:

1. Configuration Properties->General->use Managed Extension : Yes
2. C/C++->General->Debug Information Format : Program Database (/Zi)
3. C/C++->Code Generation->Enable Minimal Build : No
4. C/C++->Basic Run-Time Check : Default

then in the CMyClassDlg.cpp did the following:

#using <mscorlib.dll>
#using <System.dll>
using namespace System;
#using <System.Xml.dll>
#using <System.Data.dll>

and in the OnInitDialog() did :

XmlDocument *xmlDoc = new XmlDocument();
//Just this to try

and compile this error message appeared:

(105): error C3828: 'System::Xml::XmlDocument': placement arguments not
allowed while creating instances of managed classes

I dont know why this error generated ,though I did the same thing in my
ISAPI Filter DLL project and used XmlDocument
and SqlClient effectively.

why this happening in MFC application .
Any Idea? Regards.