如何在WMI查询上设置超时？

try
{
    string loggedonuser = null;

    string computername = \"ComputerToQuery\";

    ConnectionOptions co = new ConnectionOptions();

    co.Username = \"DOMAIN\\MyUser\";
    co.Password = \"MyPassword\";

    co.Impersonation = ImpersonationLevel.Impersonate;
    co.Authentication = AuthenticationLevel.Default;

    ManagementPath mp = new ManagementPath(@\"\\\\\" + computername + @\"\\root\\cimv2\");

    ManagementScope ms = new ManagementScope(mp,co);

    ms.Connect();

    ObjectQuery oq = new ObjectQuery(\"SELECT username FROM Win32_ComputerSystem\");

    ManagementObjectSearcher mos = new ManagementObjectSearcher(ms,oq);

    foreach(ManagementObject mo in mos.Get())
        loggedonuser = (String) mo[\"username\"];
}
catch(Exception e)
{
    // Handle WMI exception
}