<!-- Bring in appropriate referenced assembly version  -->
<configuration>
  <startup>
    <requiredRuntime version="v1.0.3705"/>
    <supportedRuntime version="v1.1.4322"/>
    <supportedRuntime version="v1.0.3705"/>
  </startup>
  <runtime>

    <!-- binding rules under .NET 1.0: -->
    <assemblyBinding
      xmlns="urn:schemas-microsoft-com:asm.v1"
      appliesTo="v1.0.3705">

      <dependentAssembly>

        <!-- when binding to System.Windows.Forms, -->
        <assemblyIdentity
          name="System.Windows.Forms"
          publicKeyToken="b77a5c561934e089"
          culture="neutral"/>

        <!-- load System.Windows.Forms 1.0 -->
        <bindingRedirect
          oldVersion="0.0.0.0-65535.65535.65535.65535"
          newVersion="1.0.3300.0"/>

      </dependentAssembly>
      •••
    </assemblyBinding>

  </runtime>
</configuration>

// This method called under .NET 1.0
void UseMyFolderBrowser() {
  MyFolderBrowseDialog dlg = new MyFolderBrowseDialog();
  dlg.ShowDialog();
}

// This method called under .NET 1.1
void UseFolderBrowser() {
  FolderBrowserDialog dlg = new FolderBrowserDialog();
  dlg.ShowDialog();
}

// This method called under .NET 1.0 or 1.1
// No 1.1 types or methods used in this method
void browseButton_Click(object sender, EventArgs e) {
  if( Environment.Version <= new Version("1.1") ) {
    UseMyFolderBrowser();
  }
  else {
    UseFolderBrowser();
  }
}

public MyThemedForm() {
  // Required for Windows Form Designer support
  InitializeComponent();

  // Set the FlatStyle for all controls
  SetFlatStyleSystem(this);
}

void SetFlatStyleSystem(Control parent) {
  foreach( Control control in parent.Controls ) {
    // Only these controls have a FlatStyle property
    ButtonBase button = control as ButtonBase;
    GroupBox group = control as GroupBox;
    Label label = control as Label;
    if( button != null ) button.FlatStyle = FlatStyle.System;
    else if( group != null ) group.FlatStyle = FlatStyle.System;
    else if( label != null ) label.FlatStyle = FlatStyle.System;

    // Set contained controls FlatStyle, too
    SetFlatStyleSystem(control);
  }
}

class CWinFormsControlSite : public COleControlSite {
public:
  CWinFormsControlSite(COleControlContainer* pCtrlCont)
  : COleControlSite(pCtrlCont) {}

  // Most of this implementation is copied from occsite.cpp
  virtual HRESULT CreateControl(
    CWnd* pWndCtrl,
    REFCLSID clsid, // ignored
    ...) {
      HRESULT hr = E_FAIL;
      •••

      // Wrap existing WinForms control
      // instead of creating a new COM control
      if (SUCCEEDED(hr = WrapWinFormsControl(...))) {
        •••
      }

      •••
      return hr;
    }

protected:
  // This code is based on COleControlSite::CreateOrLoad,
  // but without support for persistence or licensing
  virtual HRESULT WrapWinFormsControl(...) {
      HRESULT hr = E_FAIL;
      •••

      CWinFormsControlWnd* pWndCtrlLocal =
        (CWinFormsControlWnd*)m_pWndCtrl;

      CComPtr<IUnknown> spunk;
      hr = pWndCtrlLocal->GetControl(&spunk);

      •••
      return hr;
    }
};

class CWinFormsControlWnd : public CWnd {
public:
  BOOL Create(
    IUnknown* punkControl, // Interface of WinForms control
    DWORD dwStyle,
    const RECT& rect,
    CWnd* pParentWnd,
    UINT nID) {
    // Cache control interface pointer
    spunkControl = punkControl;

    // This call will end up in CWinFormsControlSite
    // CreateControl, which is why it's OK to pass a
    // NULL CLSID (we're wrapping a pre-existing
    // WinForms control, not creating a new COM control)
    return CreateControl(CLSID_NULL, ...);
  }

  HRESULT GetControl(IUnknown** ppunk) {
    if( !ppunk ) return E_POINTER;
    if( !spunkControl ) return E_UNEXPECTED;
    return spunkControl->QueryInterface(ppunk);
  }

  •••
  CComPtr<IUnknown> spunkControl;
};

// Can't use this and create instances of managed types
//#ifdef _DEBUG
//#define new DEBUG_NEW
//#endif

// Bring in the System.Windows.Forms assembly
#using <System.dll>
#using <System.Windows.Forms.dll>

BOOL CMfcWinFormsHostDlg::OnInitDialog() {
  CDialog::OnInitDialog();

  // Create WinForms control(s)
  System::Windows::Forms::MonthCalendar* pcal =
    new System::Windows::Forms::MonthCalendar();

  // Get interface pointer from control
  CComPtr<IUnknown> spunkControl;
  spunkControl.Attach((IUnknown*)System::Runtime::InteropServices::
      Marshal::GetIUnknownForObject(pcal).ToPointer());

  // Get rect of placeholder control and then hide it
  CRect rectPlaceHolder;
  •••

  // Wrap control and place in on the parent window
  m_wndWinFormsCalendar.Create(
    spunkControl,
    WS_VISIBLE | WS_TABSTOP,
    rectPlaceHolder,
    this,
    0);

  return TRUE;  // return TRUE  unless you set the focus to a control
}

// Form1.cpp
#include "stdafx.h"
#include "Form1.h"
#include <windows.h>

using namespace CppWinForms;

int APIENTRY _tWinMain(HINSTANCE hInstance,
                       HINSTANCE hPrevInstance,
                       LPTSTR    lpCmdLine,
                       int       nCmdShow) {
  System::Threading::Thread::CurrentThread->ApartmentState =
      System::Threading::ApartmentState::STA;
  Application::Run(new Form1());
  return 0;
}

// Form1.h
namespace CppWinForms {
  using namespace System;
  using namespace System::ComponentModel;
  using namespace System::Collections;
  using namespace System::Windows::Forms;
  using namespace System::Data;
  using namespace System::Drawing;

public __gc class Form1 : public System::Windows::Forms::Form {	
public:
  Form1(void) {
    InitializeComponent();
  }

protected:
  void Dispose(Boolean disposing) {
    if (disposing && components) {
      components->Dispose();
    }
    __super::Dispose(disposing);
  }

private:
  System::ComponentModel::Container * components;

  void InitializeComponent(void) {
    this->components = new System::ComponentModel::Container();
    this->Size = System::Drawing::Size(300,300);
    this->Text = S"Form1";
  }
};
}