Экспорт данных из DataGridView в Excel файл - C#

private void ExportToExcel()
         {
             Microsoft.Office.Interop.Excel.Application exApp = new Microsoft.Office.Interop.Excel.Application();
             exApp.Workbooks.Add();
             Microsoft.Office.Interop.Excel.Worksheet workSheet = (Microsoft.Office.Interop.Excel.Worksheet)exApp.ActiveSheet;
             workSheet.Cells[1, 1] = "x";
             workSheet.Cells[1, 2] = "Prls";
             workSheet.Cells[1, 3] = "Prlspv";
             workSheet.Cells[1, 4] = "Pvihrls";
             int rowExcel = 2; //начать со второй строки.
             for (int i = 0; i < result_grid.Rows.Count; i++)
             {
                 //заполняем строку
                 workSheet.Cells[rowExcel, "A"] = result_grid.Rows[i].Cells["x"].Value;
                 workSheet.Cells[rowExcel, "B"] = result_grid.Rows[i].Cells["Prls"].Value;
                 workSheet.Cells[rowExcel, "C"] = result_grid.Rows[i].Cells["Prlspv"].Value;
                 workSheet.Cells[rowExcel, "D"] = result_grid.Rows[i].Cells["Pvihrls"].Value;
                 ++rowExcel;
                 string pathToXmlFile;
                 pathToXmlFile = Environment.CurrentDirectory + "\" + "MyFile.xls";
                 workSheet.SaveAs(pathToXmlFile);
                 exApp.Quit();
             }
         }