Can't delete C++/CLI directory, how to fix?

Question

C++ / C#

The code:

string itog = y + "\\garrysmod\\cache";

if (!fin.is_open()) { fin.close(); return; } fin.close();

if (checkedListBox1->GetItemChecked(2)) {
  RemoveDirectoryA(itog.c_str());
}

There are no errors, the folder is simply not deleted!