C#

class A<br />
 {<br />
  int m_retParam&<br />
  A(int ¶m) : m_retParam(retParam){<br />
    }<br />
  public void DoSomething(){<br />
    m_retParam = 5; // new value<br />
    }<br />
 }

class A<br />
  {<br />
  ref int m_retParam;       :doh:   <----------- Compilter error<br />
<br />
  A(ref int param) {<br />
    m_retParam=param;<br />
    }<br />
  public void DoSomething(){<br />
    m_retParam = 5; // new value<br />
    }<br />
  }

 private void dgvAllEvents_RowsAdded(object sender, DataGridViewRowsAddedEventArgs e)<br />
 {<br />
   // This message occurs AFTER the row has been added.<br />
   // Some code here checks flags to see if this is first row added, etc<br />
   ...<br />
   dgvAllEvents.AutoResizeColumn(0, DataGridViewAutoSizeColumnMode.DisplayedCellsExceptHeader);<br />
 }<br />
<br />

// C++ CODE

#include <windows.h>
#include <vcclr.h>
#using <System.dll>
using namespace System;


// from msdn
class UnManagedClass
{
public:
	LPCWSTR GetPropertyA() { return 0; }
	void MethodB ( LPCWSTR ) {}
};

public ref class AdapterNET
{
private:
	UnManagedClass * m_unman;

public:
	// allocate unmanaged object
	AdapterNET() : m_unman( new UnManagedClass ) {}

	// deallocate unmanaged object
	~AdapterNET() { delete m_unman; }

protected:
	// deallocated unmanaged object in finalizer in case the constructor is never called
	!AdapterNET() { delete m_unman; }

public:
	property String ^ get_PropertyA
	{
		String ^ get()
		{
			return gcnew  String( m_unman->GetPropertyA() );
		}
	}

	void MethodB( String ^ aString )
	{
		pin_ptr<const WCHAR> str = PtrToStringChars( aString );
		m_unman->MethodB( str );
	}
};

// C# CODE
using System;
using System.Collections.Generic;
using System.Text;

namespace TestingAdapterNET
{
	class AdapterNETDriver
	{
		static void Main( string[] args )
		{
			AdapterNET _adapterNET = new AdapterNET();  // <-- crashes here
			string propA = _adapterNET.get_PropertyA;
			_adapterNET.MethodB( propA );
		}
	}
}