Excel .Net

using System;
                    using System.IO;
                    using SautinSoft;
                    namespace Sample
                    {
                        class Sample
                        {
                            static void Main(string[] args)
                            {
                                ExcelToPdf x = new ExcelToPdf();
                                x.OutputFormat = SautinSoft.ExcelToPdf.eOutputFormat.Pdf;
                                string excelFile = Path.GetFullPath(@"..\..\..\test.xlsx");
                                string pdfFile = Path.ChangeExtension(excelFile, ".pdf"); ;
                                try
                                {
                                    x.ConvertFile(excelFile, pdfFile);
                                    System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo(pdfFile) { UseShellExecute = true });
                                }
                                catch (Exception ex)
                                {
                                    Console.WriteLine(ex.Message);
                                    Console.ReadLine();
                                }
                            }
                        }
                    }