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private bool exportCSV(string filepath, char separator, ArrayList csv_data)
        {
            bool retVal = true;

            try
            {
                FileStream outStream = new FileStream(filepath, FileMode.OpenOrCreate);
                StreamWriter sw = new StreamWriter(outStream, System.Text.Encoding.Default);
                string csv_line;

                foreach (string[] product in csv_data)
                {
                    csv_line = "";
                    foreach (string value in product)
                    {
                        csv_line = csv_line + value + separator;
                    }
                    sw.WriteLine(csv_line);
                }
                sw.Close();
            }
            catch (Exception e) 
            {
                retVal = false;
            }

            return retVal;
        }