Security Visual C++ .NET

#include "stdafx.h"
using namespace System;
using namespace System::Security;
using namespace System::Security::Permissions;
using namespace System::Security::Policy;
void main()
{
    CodeGroup^ machine;
    System::Collections::IEnumerator^ ph = SecurityManager::PolicyHierarchy();
    for (int i = machine->Children->Count - 1; i >= 0; i--)
    {
        if(((CodeGroup^)machine->Children[i])->Name == "ReadOnly Secure Group")
        {
            machine->RemoveChild(((CodeGroup^)machine->Children[i]));
        }
    }
    SecurityManager::SavePolicy();
}