private void ReadExisting(string allLines)
        {
            if (string.IsNullOrEmpty(allLines))
            {
                return;
            }

            var chars = allLines.AsEnumerable().Where(c => c != '\r');

            foreach (var c in chars)
            {
                if (c == ParseChar)
                {
                    valueParserAdd.AddValue(valueBuilder.ToString());
                    valueBuilder.Clear();
                }
                else
                {
                    valueBuilder.Append(c);
                }
            }
        }