How to convert the PDF document into Excel?

//Specify the installation path of java
ProcessStartInfo startInfo = new ProcessStartInfo(@"C:\Program Files\Java\jre1.8.0_144\bin\java.exe");
 
startInfo.WindowStyle = ProcessWindowStyle.Hidden;
 
//Set the input folder path to WorkingDirectory
startInfo.WorkingDirectory = InputPath;
 
startInfo.Arguments = "-jar tabula-0.8.0-jar-with-dependencies.jar -p all -o sample.csv sample.pdf";
 
//The ‘sample.csv’ file has been generated in the specified working directory when started the ProcessStartInfo
Process currentProcess=Process.Start(startInfo);
 
currentProcess.WaitForExit();
 
string[] files = Directory.GetFiles(InputPath, "*.csv");
 
ExcelEngine excelEngine = new ExcelEngine();
 
IApplication application = excelEngine.Excel;
 
IWorkbook workbook = application.Workbooks.Open(files[0]);
 
IWorksheet sheet = workbook.Worksheets[0];
 
application.DefaultVersion = ExcelVersion.Excel2013;
 
workbook.Version = ExcelVersion.Excel2013;
 
string fileName = "sample.xlsx";//Saves the Excel file into specific location
workbook.SaveAs("../../Output/"+fileName,ExcelSaveType.SaveAsXLS);
 
workbook.Close();
 
excelEngine.Dispose();