c# cpu mac hdd md5 serial oluşturma

using System;
	using System.Management;
	using System.Net.NetworkInformation;
	using System.Security.Cryptography;
	using System.Text;
	using System.Windows.Forms;
	namespace ComputerInfo
	{
	public partial class Form1 : Form
	{
	public Form1()
	{
	InitializeComponent();
	}
	private void Form1_Load(object sender, EventArgs e)
	{
	try
	{
	var cpuid = string.Empty;
	var hddserial = string.Empty;
	var motherboardserial = string.Empty;
	var macaddress = string.Empty;
	#region cpu id
	string sQuery = "SELECT ProcessorId FROM Win32_Processor";
	ManagementObjectSearcher oManagementObjectSearcher = new ManagementObjectSearcher(sQuery);
	ManagementObjectCollection oCollection = oManagementObjectSearcher.Get();
	foreach (ManagementObject oManagementObject in oCollection)
	{
	cpuid = (string)oManagementObject["ProcessorId"];
	break;
	}
	#endregion cpu id
	#region mac address
	NetworkInterface[] nics = NetworkInterface.GetAllNetworkInterfaces();
	String sMacAddress = string.Empty;
	foreach (NetworkInterface adapter in nics)
	{
	if (sMacAddress == String.Empty)
	{
	IPInterfaceProperties properties = adapter.GetIPProperties();
	macaddress = adapter.GetPhysicalAddress().ToString();
	}
	}
	#endregion mac address
	#region hdd serial
	ManagementObject dsk = new ManagementObject(@"win32_logicaldisk.deviceid=""c:""");
	dsk.Get();
	hddserial = dsk["VolumeSerialNumber"].ToString();
	#endregion hdd serial
	#region motherboard serial
	ManagementObjectSearcher mos = new ManagementObjectSearcher("SELECT * FROM Win32_BaseBoard");
	ManagementObjectCollection moc = mos.Get();
	foreach (ManagementObject mo in moc)
	{
	motherboardserial = (string)mo["SerialNumber"];
	break;
	}
	#endregion motherboard serial
	var code = cpuid.Trim() + " " + hddserial.Trim() + " " + motherboardserial.Trim() + " " + macaddress.Trim();
	code = GetMd5Sum(code);
	txtLicence.Text = code;
	}
	catch (Exception ex)
	{
	string error = ex.Message;
	MessageBox.Show("Error: " + ex.Message);
	}
	}
	public static string GetMd5Sum(string str)
	{
	Encoder enc = System.Text.Encoding.Unicode.GetEncoder();
	byte[] unicodeText = new byte[str.Length * 2];
	enc.GetBytes(str.ToCharArray(), 0, str.Length, unicodeText, 0, true);
	MD5 md5 = new MD5CryptoServiceProvider();
	byte[] result = md5.ComputeHash(unicodeText);
	StringBuilder sb = new StringBuilder();
	for (int i = 0; i < result.Length; i++)
	{
	sb.Append(result[i].ToString("X2"));
	}
	return sb.ToString();
	}
	}
	}