Error: fatal error C1190: managed targeted code requires a '/clr' option?

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I created a dll file to call the functions in it, it contains a CreateLink() function which is used to create shortcut file for exe. This is link of article: Creating and Resolving shell links[^], that is a class, i want to convert it to Win32API, i did as follows:

#include "stdafx.h"
#using <mscorlib.dll>
#include <Shlobj.h>
#include <crtdbg.h>
#include <atldef.h>
#include <atlconv.h>

BOOL APIENTRY DllMain( HMODULE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
					 )
{
	switch (ul_reason_for_call)
	{
	case DLL_PROCESS_ATTACH:
	case DLL_THREAD_ATTACH:
	case DLL_THREAD_DETACH:
	case DLL_PROCESS_DETACH:
		break;
	}
	return TRUE;
}



HRESULT _CreateLink(LPCWSTR FilePath, LPCWSTR LnkPath, LPCWSTR LnkDesc,LPCWSTR WorkDir) 
{ 
    USES_CONVERSION;
    CoInitialize(NULL);
    IShellLink* psl;             
    HRESULT  hres = CoCreateInstance(CLSID_ShellLink, NULL, 
            CLSCTX_INPROC_SERVER, IID_IShellLink, (LPVOID *) &psl); 
    if (SUCCEEDED(hres)) 
    { 
        IPersistFile* ppf; 
         
        psl->SetPath(W2A(FilePath)); 
        psl->SetWorkingDirectory(W2A(WorkDir));
        psl->SetDescription(W2A(LnkDesc)); 
            
        hres = psl->QueryInterface(IID_IPersistFile,(LPVOID*)&ppf); 
 
        if (SUCCEEDED(hres)) 
        {    
            hres = ppf->Save(LnkPath, TRUE); 
            ppf->Release(); 
        } 
        psl->Release(); 
    }
    CoUninitialize();
    return hres;
}

bool _stdcall CreateLink(LPCWSTR FilePath, LPCWSTR LnkPath, LPCWSTR LnkDesc,LPCWSTR WorkDir)
{
    IntPtr strfilepath = Marshal::StringToCoTaskMemUni(FilePath);
    IntPtr strlnkpath = Marshal::StringToCoTaskMemUni(LnkPath);
    IntPtr strlnkdesc = Marshal::StringToCoTaskMemUni(LnkDesc);
    IntPtr strworkdir = Marshal::StringToCoTaskMemUni(WorkDir);
    
    HRESULT hres = _CreateLink((LPCWSTR)strfilepath.ToPointer(),
                               (LPCWSTR)strlnkpath.ToPointer(),
                               (LPCWSTR)strlnkdesc.ToPointer(),
                               (LPCWSTR)strworkdir.ToPointer());

    Marshal::FreeCoTaskMem(strfilepath);
    Marshal::FreeCoTaskMem(strlnkpath);
    Marshal::FreeCoTaskMem(strlnkdesc);
    Marshal::FreeCoTaskMem(strworkdir);

    return (hres==S_OK);
}

When i compiled it, it generated an error (at line "#using <mscorlib.dll>"):

Error	1 fatal error C1190: managed targeted code requires a '/clr' option	c:\Users\Peter\Desktop\abc\abc\dllmain.cpp	3	abc

I searched that error, but I couldnt solve it. Please help me. Thanks.

P/s: I use VS2008 to code.