修改mac

RegistryKey hklm = Registry.LocalMachine;
RegistryKey key = hklm.OpenSubKey(@"/SYSTEM/ControlSet001/Control/Class/{4D36E972-E325-11CE-BFC1-08002BE10318}/0001", true);
string networkAddress = labMac.Text.Trim();
            key.SetValue("NetworkAddress ", networkAddress);