.net Winfom NPOI Export Excel (pop-up window custom save path and file name)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using NPOI.HSSF.UserModel;
using System.IO;
using System.Windows.Forms;
using Model;
using NPOI.XSSF.UserModel;//调用NPOI引用

DAL.Helper namespace
{
    public class PrintHelper
    {
        public void PrintMsg (StudentModel objStudentModel)
        {
            // Open Excle pre-written template, the current permission is read-only
            FileStream theExcel = new FileStream (@ " E: \ rcmeng \ source \ Test Program \ AppOfStudents \ AppOfStudents \ bin \ Debug \ StudentInfo.xlsx ", FileMode.Open, FileAccess.Read);

            // call Excle template, and create a new workbook, if your computer Excle version is 2007 or less, compared with HSSFWorkbook, if it is 2007 or more , compared XSSFWorkbook
            XSSFWorkbook theStudentInfo = new new XSSFWorkbook (theExcel);

            // create or acquire a worksheet, as has been previously written a good template, you can directly call the template worksheet, worksheet name being called here "info"
            XSSFSheet theStudentInfoSheet = (XSSFSheet) theStudentInfo.GetSheet ( "Info");
 

            // NPOI operation, the encapsulated data (objStudentModel) are successively filled into the Excle
            XSSFCell cellId = (XSSFCell) theStudentInfoSheet.GetRow (. 3) .GetCell (. 3);
            cellId.SetCellValue (objStudentModel.StudentId);
            XSSFCell cellName = ( XSSFCell) theStudentInfoSheet.GetRow (. 3) .GetCell (. 5);
            cellName.SetCellValue (objStudentModel.StudentName);
            XSSFCell cellGender = (XSSFCell) theStudentInfoSheet.GetRow (. 3) .GetCell (. 7);
            cellGender.SetCellValue (objStudentModel.Gender);
            cellClassName = XSSFCell (XSSFCell) theStudentInfoSheet.GetRow (. 5) .GetCell (. 3);
            cellClassName.SetCellValue (objStudentModel.ClassName);
            XSSFCell cellPhoneNumber = (XSSFCell)theStudentInfoSheet.GetRow(5).GetCell(5);
            cellPhoneNumber.SetCellValue(objStudentModel.PhoneNumber);
            XSSFCell cellStudentAddress = (XSSFCell)theStudentInfoSheet.GetRow(7).GetCell(3);
            cellStudentAddress.SetCellValue(objStudentModel.StudentAddress);
 

            Save the file //
            // prompt the user to save the file location (IO extension is referenced file)
            SaveFileDialog saveFile = new new SaveFileDialog ();
            // new default file name extension, Excle as .xlsx files or .xls
            saveFile.DefaultExt = ".xlsx";
            // save as type settings (lazy, so just write a set item)
            saveFile.Filter = "Excel files | * .xlsx";
            // new file name default setting is "student information"
            String fileName = "student information";
            // will have set a good default name assigned
            saveFile.FileName = fileName;
            // pop-up dialog box
            saveFile.ShowDialog ();
            // filename can be modified and saved
            fileName = saveFile.FileName;
            / / click cancel
            if (fileName.IndexOf ( ":") <0)
            {
                return;
            }
            // Click OK
            IF (fileName = ""!)
            {
                // create a new file stream, create a new file
                the FileStream = new new newFile the FileStream (saveFile.FileName, FileMode.Create);
                theStudentInfo.Write (newFile);
                // Close file stream
                newFile.Close ();
                // the GC garbage collection
                the GC.SuppressFinalize (the this);
            }

        }
    }
}