IDataReader into csv

        
        /// <summary>
        ///  Method for converting reader into CSV
        /// </summary>
        /// <param name="dataReader"></param>
        /// <param name="includeHeaderAsFirstRow"></param>
        /// <param name="separator"></param>
        /// <returns></returns>
        public  Stream ToCSV(IDataReader dataReader, bool includeHeaderAsFirstRow, string separator)
        {
            Stream csv = new TempFileStream();
            StreamWriter csvRows = new StreamWriter(csv);
            StringBuilder sb = null;

            if (includeHeaderAsFirstRow)
            {
                sb = new StringBuilder();
                for (int index = 0; index < dataReader.FieldCount; index++)
                {
                    if (dataReader.GetName(index) != null)
                        sb.Append(dataReader.GetName(index));

                    if (index < dataReader.FieldCount - 1)
                        sb.Append(separator);
                }
                csvRows.WriteLine(sb.ToString());
            }

            while (dataReader.Read())
            {
                sb = new StringBuilder();
                for (int index = 0; index < dataReader.FieldCount - 1; index++)
                {
                    if (!dataReader.IsDBNull(index))
                    {
                        string value = dataReader.GetValue(index).ToString();
                        if (dataReader.GetFieldType(index) == typeof(String))
                        {
                            //If double quotes are used in value, ensure each are replaced but 2.
                            if (value.IndexOf("\"") >= 0)
                                value = value.Replace("\"", "\"\"");

                            //If separtor are is in value, ensure it is put in double quotes.
                            if (value.IndexOf(separator) >= 0)
                                value = "\"" + value + "\"";
                        }
                        sb.Append(value);
                    }

                    if (index < dataReader.FieldCount - 1)
                        sb.Append(separator);
                }

                if (!dataReader.IsDBNull(dataReader.FieldCount - 1))
                    sb.Append(dataReader.GetValue(dataReader.FieldCount - 1).ToString().Replace(separator, " "));

                csvRows.WriteLine(sb.ToString());
            }

            csvRows.Flush();
            dataReader.Close();
            return csv;
        }