ConvertCS

using System;
using System.IO;

using GemBox.Spreadsheet;

namespace Samples
{
    /// <summary>
    /// Conversion sample.
    /// </summary>
    class Convert
    {
        [STAThread]
        static void Main(string[] args)
        {
            // TODO: If using GemBox.Spreadsheet Professional, put your serial key below.
            // Otherwise, if you are using GemBox.Spreadsheet Free, comment out the 
            // following line (Free version doesn't have SetLicense method). 
            // SpreadsheetInfo.SetLicense("YOUR-SERIAL-KEY-HERE");

            if (args.Length != 2)
                Console.Write("\n ConvertCS[.exe] InputFile OutputFile\n");
            else
            {
                ExcelFile ef = new ExcelFile();

                switch (Path.GetExtension(args[0]).ToUpper())
                {
                    case ".XLS":
                        ef.LoadXls(args[0]);
                        break;

                    case ".CSV":
                        ef.LoadCsv(args[0], CsvType.CommaDelimited);
                        break;

                    case ".XLSX":
                        ef.LoadXlsx(args[0], XlsxOptions.None);
                        break;

                    default:
                        throw new Exception("You must specify input file name with a valid extension (.XLS, .CSV or .XLSX).");
                }

                switch (Path.GetExtension(args[1]).ToUpper())
                {
                    case ".XLS":
                        ef.SaveXls(args[1]);
                        break;

                    case ".CSV":
                        ef.SaveCsv(args[1], CsvType.CommaDelimited);
                        break;

                    case ".XLSX":
                        ef.SaveXlsx(args[1]);
                        break;

                    default:
                        throw new Exception("You must specify output file name with a valid extension (.XLS, .CSV or .XLSX).");
                }

                Console.WriteLine("\n " + args[0] + " converted to " + args[1]);
            }
        }
    }
}