Need Help get error message on using excel

[christing]

I am using c# to write my code but i get error message on below code.did i missing insert anything. the purpose i create this project is want excel file can convert to txt file using c# code
using Excel;



// Reading Excel file format; *.xlsx

FileStream stream = File.Open(file, FileMode.Open, FileAccess.Read);
IExcelDataReader excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream);
result = excelReader.AsDataSet();
excelReader.Close();

// Reading Excel file ('97-2003 format; *.xls)

FileStream stream = File.Open(file, FileMode.Open, FileAccess.Read);
IExcelDataReader excelReader = ExcelReaderFactory.CreateBinaryReader(stream);
result = excelReader.AsDataSet();
excelReader.Close();

[ranman256]

instead of streaming the text file, use excel import

xl.ActiveSheet.querytables.add(connection:='TEXT;. ....