c#读取mac和硬盘号

using System;
using System.Collections.Generic;
using System.Text;
using System.Management;

namespace Common
...{
    public class GetPhysicsNum
    ...{
        public string GetNetCardMacAddress()
        ...{
            ManagementClass mc;
            ManagementObjectCollection moc;
            mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
            moc = mc.GetInstances();
            string str = "";
            foreach (ManagementObject mo in moc)
            ...{
                if ((bool)mo["IPEnabled"] == true)
                    str = mo["MacAddress"].ToString();

            }
            return str;
        }

        /**//// <summary>
        /// C盘序列号
        /// </summary>
        /// <returns></returns>
        public string GetDiskVolumeSerialNumber()
        ...{
            ManagementObject disk;
            disk = new ManagementObject("win32_logicaldisk.deviceid="c:"");
            disk.Get();
            return disk.GetPropertyValue("VolumeSerialNumber").ToString();
        }
 
    }
}