How to disable network?

How to disable network?

var wmiQuery = new SelectQuery("SELECT * FROM Win32_NetworkAdapter " +
                    "WHERE NetConnectionId != null " +
                    "AND Manufacturer != 'Microsoft' ");
using (var searcher = new ManagementObjectSearcher(wmiQuery))
{
    foreach (ManagementObject item in searcher.Get())
    {
        Console.WriteLine((String)item["NetConnectionId"]);

        using (item)
        {
            item.InvokeMethod("Disable", null);
        }
    }
}