WriteLine() public method

Make sure you have a value for every column! This is really intentionally not thread safe, do not share this class across threads. really, don't write one of these files across multiple threads at the same time.
public WriteLine ( IEnumerable values ) : bool
values IEnumerable
return bool
        public void ReadExcelFile()
        {
            FileStream input = new FileStream(InputFile, FileMode.Open, FileAccess.Read);

            IExcelDataReader reader = ExcelReaderFactory.CreateBinaryReader(input);
            IDataFileWriter writer = new CommaSeparatedValueWriter(OutputFile);

            reader.IsFirstRowAsColumnNames = false;
            DataSet result = reader.AsDataSet();

            foreach (DataTable t in result.Tables)
            {
                writer.WriteLine(new string[] { t.TableName });
                List<string> columns = new List<string>();

                foreach (DataColumn column in t.Columns)
                {
                    columns.Add(column.ColumnName);
                }

                writer.WriteLine(columns);

                foreach (DataRow row in t.Rows)
                {
                    List<string> fields = new List<string>();
                    foreach (object f in row.ItemArray)
                    {
                        fields.Add(f.ToString());
                    }

                    writer.WriteLine(fields);
                }

                writer.WriteLine(null);
            }

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

            Assert.AreEqual(File.ReadAllText(OutputFile), File.ReadAllText(CheckFile));
        }