C# Get Serial Number

import System.Management;
public static string getSN()
        {
            ManagementObjectSearcher searcher = new ManagementObjectSearcher("select * from Win32_Processor");
            string collectedInfo = ""; // here we will put the informa
 
            searcher.Query = new ObjectQuery("select * from Win32_BIOS");
            foreach (ManagementObject share in searcher.Get())
            {
                //then, the serial number of BIOS
                collectedInfo += share.GetPropertyValue("SerialNumber").ToString();
            }
            return collectedInfo;
        }