load in a CSV file and wrap any field that isn't already in quotes with quotes

gistfile1.cs

    class Program
    {
        /// <summary>
        ///  load in a CSV file and wrap any field that isn't in quotes with quotes
        /// </summary>
        /// <param name="args"></param>
        static void Main(string[] args)
        {
            var reader = File.OpenText(Path.Combine(Directory.GetCurrentDirectory(),args[0]));

            var writer = new StreamWriter(Path.Combine(Directory.GetCurrentDirectory(), args[1]));

            var data = reader.ReadLine();

            while (!string.IsNullOrEmpty(data))
            {
                // split the line
                var elem = data.Split(new[]{','});

                var list = new List<string>();
                for (var i = 0; i < elem.Count(); i++)
                {
                    var sample = elem[i];
                    
                    // check that if we start with a quote we end with one i.e. we 
                    // haven't accidently split on a comma that was encapsulated by "'s
                    if (FieldStartsWithQuote(sample))
                    {
                        while (elem[i][elem[i].TrimEnd().Count()-1] != '"')
                        {
                            sample += "," + elem[i + 1];
                            i++;
                        }
                    }
                    list.Add(sample);
                }

                for (var i = 0; i < list.Count; i++)
                {
                    // wrap fields without quotes
                    if (!FieldStartsWithQuote(list[i]))
                        list[i] = "\"" + list[i] + "\"";
                }

                writer.WriteLine(string.Join(",", list).TrimEnd(','));

                data = reader.ReadLine();
            }

            writer.Close();
            reader.Close();
        }

        private static bool FieldStartsWithQuote(string sample)
        {
            return (!string.IsNullOrEmpty(sample)) && (sample.TrimStart()[0] == '"');
        }
    }