day5-2.cs

 do
            {
                Console.WriteLine("The index " + index + ".");
                inputCopy = input;
                inputCopy += index.ToString();
                data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(inputCopy));
                System.Text.StringBuilder sBuilder = new StringBuilder();
                for (int i = 0; i < data.Length; i++)
                {
                    sBuilder.Append(data[i].ToString("x2"));
                }
                string hash = sBuilder.ToString();
                if (hash.StartsWith("00000"))
                {
                    char pos = hash[5];
                    if (Char.IsNumber(pos))
                    {
                        if (dataList.Count > 0)
                        {
                            for (int i = 0; i < dataList.Count; i++)
                            {
                                char[] chars = dataList[i].ToCharArray();
                                if (chars[5] != pos)
                                    possString = hash;
                                else
                                    possString = "";

                            }
                            if (possString != "")
                                dataList.Add(possString);
                        }
                        else
                            dataList.Add(hash);
                    }
                }
                index++;
            } while (dataList.Count < 8);