void InvokeNative(Gnome.Vfs.AsyncHandle handle, GLib.List results)
 {
     native_cb(handle == null ? IntPtr.Zero : handle.Handle, results == null ? IntPtr.Zero : results.Handle, __data);
 }
 void InvokeNative(Gnome.Vfs.AsyncHandle handle, Gnome.Vfs.Result result)
 {
     native_cb(handle == null ? IntPtr.Zero : handle.Handle, (int)result, __data);
 }