C# Definition:

    [ComVisible(false)]
    [ComImport, InterfaceType(ComInterfaceType.InterfaceIsIUnknown), Guid("00000001-0000-0000-C000-000000000046")]
    public interface IClassFactory
    {
    void CreateInstance(IntPtr pUnkOuter, ref Guid riid, out IntPtr ppvObject);
    void LockServer(bool fLock);
    }

    An other alternative
    [ComImport, InterfaceType(ComInterfaceType.InterfaceIsIUnknown), Guid("00000001-0000-0000-C000-000000000046")]
    public interface IClassFactory
    {
    [PreserveSig]
    int CreateInstance(IntPtr pUnkOuter, ref Guid riid, out IntPtr ppvObject);
    [PreserveSig]
    int LockServer(bool fLock);
    }    

VB Definition:

  <ComVisible(False), _
  ComImport(), _
  InterfaceType(ComInterfaceType.InterfaceIsIUnknown), _
  Guid("00000001-0000-0000-C000-000000000046")> _
  Public Interface IClassFactory
    Sub CreateInstance(ByVal pUnkOuter As IntPtr, ByRef riid As Guid, <Out()> ByVal ppvObject As IntPtr)
    Sub LockServer(ByVal fLock As Boolean)
  End Interface

Notes:

None.