I am getting an error while exporting to Excel

Question

I want to transfer the data from dataGridView to Excel. For this, I added the "Microsoft.Office.Interop.Excel" plug-in to my project. I wrote the necessary codes properly. But when I run the project and click the "Export to Excel" button, I get an error. What should I do?

This is my code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace DuyuTekStokApp
{
    public partial class StockAll : Form
    {
        SqlConnection connect = new SqlConnection("Data Source=DESKTOP-L01MAVE;Initial Catalog='StockControl';Integrated Security=True");
        public StockAll()
        {
            InitializeComponent();
        }
        public void VerileriGoster(string Veriler)
        {
            SqlDataAdapter da = new SqlDataAdapter(Veriler, connect);
            DataSet ds = new DataSet();
            da.Fill(ds);
            dataGridViewAll.DataSource = ds.Tables[0];
        }
        public void changeHeader()
        {
            dataGridViewAll.Columns[0].HeaderText = "Stok Kodu";
            dataGridViewAll.Columns[1].HeaderText = "Stok Cinsi";
            dataGridViewAll.Columns[2].HeaderText = "Barkod Numarası";
            dataGridViewAll.Columns[3].HeaderText = "Birimi";
            dataGridViewAll.Columns[4].HeaderText = "Grubu";
            dataGridViewAll.Columns[5].HeaderText = "Tarih";
            dataGridViewAll.Columns[6].HeaderText = "Açıklama";
            dataGridViewAll.Columns[7].HeaderText = "Sınıfı";
            dataGridViewAll.Columns[8].HeaderText = "Değişim Tarihi";
            dataGridViewAll.Columns[9].HeaderText = "Adeti";
            dataGridViewAll.Columns[10].HeaderText = "Kritik Miktar";
            dataGridViewAll.Columns[11].HeaderText = "Resim";
        }
        private void StockAll_Load(object sender, EventArgs e)
        {
            connect.Open();
            SqlCommand cmd1 = new SqlCommand("SELECT COUNT(*) FROM StockCard", connect);
            SqlDataReader dr1 = cmd1.ExecuteReader();
            while (dr1.Read())
            {
                labelToplam.Text = dr1[0].ToString();
            }
            connect.Close();

            connect.Open();
            SqlCommand cmd2 = new SqlCommand("SELECT SUM(StokAdet) FROM StockCard", connect);
            SqlDataReader dr2 = cmd2.ExecuteReader();
            while (dr2.Read())
            {
                labelGenel.Text = dr2[0].ToString();
            }
            connect.Close();

            VerileriGoster("SELECT StokKodu, StokCinsi, StokBarkod, StokBirim, StokGrup, StokTarih, StokAciklama, StokSinif, StokSonTarih, StokAdet, StokKritik, StokResim FROM StockCard ORDER BY StokKodu ASC");
            //VerileriGoster(@"SELECT dbo.StockCard.StokKodu, dbo.StockCard.StokBarkod, dbo.StockCard.StokBirim, dbo.StockCard.StokGrup, dbo.StockCard.StokTarih, dbo.StockCard.StokResim, dbo.StockMove.MoveAdet, dbo.StockMove.MoveMevcut, dbo.StockMove.MoveSinif, dbo.StockMove.MoveTarih
            //                     FROM  dbo.StockMove INNER JOIN
            //                  dbo.StockCard ON dbo.StockMove.StokID = dbo.StockCard.StokID ORDER BY StokKodu ASC ");
            changeHeader();
        }

        private void dataGridViewAll_CellClick(object sender, DataGridViewCellEventArgs e)
        {
            int secilen = dataGridViewAll.SelectedCells[0].RowIndex;
            labelUrun.Text = dataGridViewAll.Rows[secilen].Cells[9].Value?.ToString();
            labelKrit.Text = dataGridViewAll.Rows[secilen].Cells[10].Value.ToString();
            byte[] bytes = (byte[])dataGridViewAll.Rows[secilen].Cells[11].Value;
            MemoryStream ms = new MemoryStream(bytes);
            pictureBoxResim.Image = Image.FromStream(ms);
        }

        private void btnExcel_Click(object sender, EventArgs e)
        {
            Microsoft.Office.Interop.Excel._Application app = new Microsoft.Office.Interop.Excel.Application();
            Microsoft.Office.Interop.Excel._Workbook workbook = app.Workbooks.Add(Type.Missing);
            Microsoft.Office.Interop.Excel._Worksheet worksheet = null;
            worksheet = workbook.Sheets["Sheet1"];
            worksheet = workbook.ActiveSheet;
            worksheet.Name = "Stok Bilgisi";

            for (int i = 1; i < dataGridViewAll.Columns.Count + 1; i++)
            {
                worksheet.Cells[i, 1] = dataGridViewAll.Columns[i - 1].HeaderText;
            }

            for (int i = 0; i < dataGridViewAll.Rows.Count; i++)
            {
                for (int j = 0; j < dataGridViewAll.Columns.Count; i++)
                {
                    worksheet.Cells[i + 2, j + 1] = dataGridViewAll.Rows[i].Cells[j].Value.ToString();
                }
            }

            var saveFileDialog = new SaveFileDialog();
            saveFileDialog.FileName = "StokBilgisi";
            saveFileDialog.DefaultExt = ".xlsx";
            if (saveFileDialog.ShowDialog() == DialogResult.OK)
            {
                workbook.SaveAs(saveFileDialog.FileName, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
            }
            app.Quit();

            
        }
    }
}

This is the error message I get:

System.InvalidCastException
  HResult = 0x80004002
  Message = COM object of type 'Microsoft.Office.Interop.Excel.ApplicationClass' could not be assigned to interface type 'Microsoft.Office.Interop.Excel._Application'. This operation failed because the QueryInterface call on the COM component for the interface with the IID '{000208D5-0000-0000-C000-000000000046}' failed with the following error: Error loading type library / DLL. (HRESULT returned exception: 0x80029C4A (TYPE_E_CANTLOADLIBRARY)).
  Source = mscorlib
  StackTrace:
   at System.StubHelpers.StubHelpers.GetCOMIPFromRCW (Object objSrc, IntPtr pCPCMD, IntPtr & ppTarget, Boolean & pfNeedsRelease)
   at Microsoft.Office.Interop.Excel.ApplicationClass.get_Workbooks ()
   at SenseTekStokApp.StockAll.btnExcel_Click (Object sender, EventArgs e) in D: \ yNs \ VisualTutorials \ SenseTekStokApp \ SenseTekStokApp \ StockAll.cs: line 84
   at System.Windows.Forms.Control.OnClick (EventArgs e)
   at System.Windows.Forms.Button.OnClick (EventArgs e)
   at System.Windows.Forms.Button.OnMouseUp (MouseEventArgs mevent)
   at System.Windows.Forms.Control.WmMouseUp (Message & m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc (Message & m)
   at System.Windows.Forms.ButtonBase.WndProc (Message & m)
   at System.Windows.Forms.Button.WndProc (Message & m)
   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage (Message & m)
   at System.Windows.Forms.Control.ControlNativeWindow.WndProc (Message & m)
   at System.Windows.Forms.NativeWindow.DebuggableCallback (IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW (MSG & msg)
   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop (IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner (Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop (Int32 reason, ApplicationContext context)
   at System.Windows.Forms.Application.Run (Form mainForm)
   at SenseTekStokApp.Program.Main () in D: \ yNs \ VisualTutorials \ SenseTekStokApp \ SenseTekStokApp \ Program.cs: line 19

Answer 1

In essence, to use EPPlus (per comments) to save your grid to an excel file:

private void btnExcel_Click(object sender, EventArgs e)
{
  var saveFileDialog = new SaveFileDialog();
  saveFileDialog.FileName = "StokBilgisi";
  saveFileDialog.DefaultExt = ".xlsx";
  if (saveFileDialog.ShowDialog() == DialogResult.OK)
  {

    using (ExcelPackage pck = new ExcelPackage(new FileInfo(saveFileDialog.FileName)))
    {
      ExcelWorksheet ws = pck.Workbook.Worksheets.Add("StokBilgisi");
      ws.Cells["A1"].LoadFromDataTable(dataGridViewAll.DataSource as DataTable, true);
      pck.Save();
    }
  }

This is the code from the linked question/answer, adjusted for your context by insertion of dataGridViewAll.DataSource as DataTable to retrieve the datatable you bound to the grid when you called dataGridViewAll.DataSource = ds.Tables[0]; in VerileriGoster, plus some other fluff like selecting the filename to save with a SaveFileDialog

Answer 2

You can try the following steps to convert datagirdview to excel.

First, please install nuget-package Microsoft.Office.Interop.Excel.

Second, please using it in the code.

using Excel=Microsoft.Office.Interop.Excel;

Third, I suggest that you can convert datagirdview to datatable first then you can convert datatable to excel.

private void button1_Click(object sender, EventArgs e)
        {
            DataTable table = (DataTable)dataGridView1.DataSource;
            ExportToExcel(table);
        }

 public void ExportToExcel(DataTable tbl )
        {
            try
            {
                if (tbl == null || tbl.Columns.Count == 0)
                    throw new Exception("ExportToExcel: Null or empty input table!\n");

                // load excel, and create a new workbook
                var excelApp = new Excel.Application();
                var workbook=excelApp.Workbooks.Add();

                // single worksheet
                Excel._Worksheet workSheet = excelApp.ActiveSheet;

                // column headings
                for (var i = 0; i < tbl.Columns.Count; i++)
                {
                    workSheet.Cells[1, i + 1] = tbl.Columns[i].ColumnName;
                }

                // rows
                for (var i = 0; i < tbl.Rows.Count; i++)
                {
                    // to do: format datetime values before printing
                    for (var j = 0; j < tbl.Columns.Count; j++)
                    {
                        workSheet.Cells[i + 2, j + 1] = tbl.Rows[i][j];
                    }
                }

                try
                {
                    var saveFileDialog = new SaveFileDialog();
                    saveFileDialog.FileName = "StokBilgisi";
                    saveFileDialog.DefaultExt = ".xlsx";
                    if (saveFileDialog.ShowDialog() == DialogResult.OK)
                    {
                        workbook.SaveAs(saveFileDialog.FileName, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlExclusive, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
                    }
                    excelApp.Quit();
                    Console.WriteLine("Excel file saved!");
                }
                catch (Exception ex)
                {
                    throw new Exception("ExportToExcel: Excel file could not be saved! Check filepath.\n"
                    + ex.Message);
                }

            }
            catch (Exception ex)
            {
                throw new Exception("ExportToExcel: \n" + ex.Message);
            }
        }