C#得到CPU的序列号、硬盘序列号、网卡序列号

//得到cpu信息
public static void GetCpuIndex()
{
string _cpuInfo = "";
ManagementClass cimobject = new ManagementClass("Win32_Processor");
ManagementObjectCollection moc = cimobject.GetInstances();
foreach (ManagementObject mo in moc)
{
_cpuInfo = mo.Properties["ProcessorId"].Value.ToString();
} return _cpuInfo;
}
// 得到硬盘序列号public static void GetHDIndex()
{
string _HDInfo = "";
ManagementClass cimobject1 = new ManagementClass("Win32_DiskDrive");
ManagementObjectCollection moc1 = cimobject1.GetInstances();
foreach (ManagementObject mo in moc1)
{
_HDInfo = (string)mo.Properties["Model"].Value;

}
retrun _HDInfo;
}

//获取网卡硬件地址
public static void GetMacAddress()
{
string _MacAddress = "";
ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
ManagementObjectCollection moc2 = mc.GetInstances();
foreach (ManagementObject mo in moc2)
{
if ((bool)mo["IPEnabled"] == true)
MacAddress = mo["MacAddress"].ToString();
mo.Dispose();
}

return _MacAddress;
}