using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using Bytescout.Spreadsheet;

namespace Converting_XLS_to_TXT
{
class Program
{
static void Main(string[] args)
{
// Create new Spreadsheet from SimpleReport.xls file
Spreadsheet document = new Spreadsheet("SimpleReport.xls");
// Create new StringBuilder
StringBuilder builder = new StringBuilder();
// For each row
for (int row = 1; row <= document.Workbook.Worksheets[0].UsedRangeRowMax; row++)
{
// And column in first Worksheet
for (int col = 1; col <= document.Workbook.Worksheets[0].UsedRangeColumnMax; col++)
{
// Append cell value to StringBuilder
builder.AppendFormat("{0}\t", document.Workbook.Worksheets[0].Cell(row, col).Value);
}
// Append new line
builder.AppendLine();
}
// Save StringBuilder to file
File.WriteAllText("SimpleReport.txt", builder.ToString());
}
}
}

Download example source code: bytescoutxls_converting_excel_to_csv.zip (8 KB)