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Try the following code.
public static List<string> IPAddress
{
    get
    {
        ManagementClass wmi = new ManagementClass("Win32_NetworkAdapterConfiguration");
        List<string> allIPs = new List<string>();
        ManagementObjectCollection allConfigs = wmi.GetInstances();
        foreach (ManagementObject configuration in allConfigs)
        {
            if (configuration["IPAddress"] != null)
            {
                if (configuration["IPAddress"] is Array)
                {
                    string[] addresses = (string[])configuration["IPAddress"];
                    allIPs.AddRange(addresses);
                }
                else
                {
                    allIPs.Add(configuration["IPAddress"].ToString());
                }
            }
        }

        return allIPs;
    }

}

 

publicstatic string DomainName
{
    get
    {
        ManagementClass wmi = new ManagementClass("Win32_NTDomain");
        ManagementObjectCollection allConfigs = wmi.GetInstances();
        string domainName = string.Empty;
        foreach (ManagementObject configuration in allConfigs)
        {
            domainName = configuration["DomainName"] == null ? string.Empty : configuration["DomainName"].ToString();
            if (domainName.Length > 0)
                break;
        }

        return domainName;
    }
}