Генерация уникального ID компьютера

 [DllImport("kernel32.dll")]
        private static extern long GetVolumeInformation(string PathName, StringBuilder VolumeNameBuffer, UInt32 VolumeNameSize, ref UInt32 VolumeSerialNumber, ref UInt32 MaximumComponentLength, ref UInt32 FileSystemFlags, StringBuilder FileSystemNameBuffer, UInt32 FileSystemNameSize);
        public string GetVolumeSerial(string strDriveLetter)
        {
            uint serNum = 0;
            uint maxCompLen = 0;
            StringBuilder VolLabel = new StringBuilder(256); // Label
            UInt32 VolFlags = new UInt32();
            StringBuilder FSName = new StringBuilder(256); // File System Name
            strDriveLetter += ":\"; // fix up the passed-in drive letter for the API call
            long Ret = GetVolumeInformation(strDriveLetter, VolLabel, (UInt32)VolLabel.Capacity, ref serNum, ref maxCompLen, ref VolFlags, FSName, (UInt32)FSName.Capacity);
            System.Security.Cryptography.MD5CryptoServiceProvider x = new System.Security.Cryptography.MD5CryptoServiceProvider();
            byte[] bs = System.Text.Encoding.UTF8.GetBytes(Ret.ToString());
            bs = x.ComputeHash(bs);
            System.Text.StringBuilder s = new System.Text.StringBuilder();
            foreach (byte b in bs)
            {
                s.Append(b.ToString("x2").ToLower());
            }
            string password = s.ToString();
 
 
            return password;
        }