Managed C++/CLI

...
#using <System.Windows.Forms.dll>
using namespace System::Windows::Forms;
...
  System::Windows::Forms::MessageBox::Show(s, S"Received String");

<br />
c.cpp(130) : error C2039: 'MessageBoxA' : is not a member of 'System::Windows::Forms'<br />
c.cpp(130) : error C2660: 'System::Windows::Forms::Control::Show' : function does not take 2 parameters<br />

//stdafx.h
#include <afxwin.h>
#include <afxtempl.h>       // MFC template support

#ifndef _INC_MMSYSTEM
#pragma message("To avoid this message, please put mmsystem.h in your PCH")
#include <mmsystem.h>
#endif

// xxx.cpp
#include "stdafx.h"

#using <mscorlib.dll>
#using <System.dll>
#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>
#include <tchar.h>

using namespace System;

using namespace System;
using namespace System::Drawing;
using namespace System::Windows::Forms;
using namespace System::ComponentModel;

// This is the entry point for this application
int _tmain(void)
{
 	MessageBox::Show(S"Allo", S"Request");
   // TODO: Please replace the sample code below with your own.
    Console::WriteLine(S"Hello World");
    return 0;
}

<code>
__gc public class MyForm : public Form
{
public:
  MyForm()
  {
    Text = S"MyForm";
  };
};
</code>