C#

public class Foo {}
public class Goo {}
public class Test
{
  [STAThread]
  static void Main( string[] args )
  {
    Foo f = null;
    Goo g = null;
    Foo ff = new Foo();
    Goo gg = new Goo();
    Console.WriteLine( Form1.TestMeAsFoo( f ) );  // False
    Console.WriteLine( Form1.TestMeAsFoo( g ) );  // False
    Console.WriteLine( Form1.TestMeAsFoo( ff ) ); // True
    Console.WriteLine( Form1.TestMeAsFoo( gg ) ); // False
    Console.WriteLine( Form1.TestMeIsFoo( f ) );  // False
    Console.WriteLine( Form1.TestMeIsFoo( g ) );  // False
    Console.WriteLine( Form1.TestMeIsFoo( ff ) ); // True
    Console.WriteLine( Form1.TestMeIsFoo( gg ) ); // False
  }
  public static bool TestMeIsFoo( object o )
  {
    return ( o is Foo );
  }
  public static bool TestMeAsFoo( object o )
  {
    return ( o as Foo ) != null;
  }
}

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"Man who stand on hill with mouth open will wait long time for roast duck to drop in." -- Confucious

dxben wrote:

I've double checked and the C++ debug version of the dll is being properly copied into the C# app's bin/debug folder, so its actually there.

Class2 c2 = new Class2("x", "y");
RemotingServices.Marshal(c2,...);