MongoDB.Bson.BsonUtils.ParseHexString C# (CSharp) Method

        public static byte[] ParseHexString(string s)
        {
            if (s == null)
            {
                throw new ArgumentNullException("s");
            }

            byte[] bytes;
            if ((s.Length & 1) != 0) 
            {
                s = "0" + s; // make length of s even
            } 
            bytes = new byte[s.Length / 2];
            for (int i = 0; i < bytes.Length; i++)
            {
                string hex = s.Substring(2 * i, 2);
                try
                {
                    byte b = Convert.ToByte(hex, 16);
                    bytes[i] = b;
                }
                catch (FormatException e)
                {
                    throw new FormatException(
                        string.Format("Invalid hex string {0}. Problem with substring {1} starting at position {2}",
                        s,
                        hex,
                        2 * i),
                        e);
                }
            }

            return bytes;
        }

 /// <summary>
 /// Initializes a new instance of the ObjectId class.
 /// </summary>
 /// <param name="value">The value.</param>
 public ObjectId(string value)
 {
     if (value == null)
     {
         throw new ArgumentNullException("value");
     }
     Unpack(BsonUtils.ParseHexString(value), out _timestamp, out _machine, out _pid, out _increment);
 }