C# Export DataGridView to Excel Sheet

using Microsoft.Office.Interop.Excel;
//Create a Button btnExport on your form and write following code on its Click Event
private void btnExport_Click(object sender, EventArgs e)
{
    SaveFileDialog sfd = new SaveFileDialog();
    DialogResult drSaveFile = sfd.ShowDialog();
    try
    {
        if (drSaveFile == System.Windows.Forms.DialogResult.OK)
        {
            ApplicationClass ExcelApp = new ApplicationClass();
            ExcelApp.Application.Workbooks.Add(Type.Missing);

            //ExcelApp.ActiveWorkbook.FileFormat = XlFileFormat.xlExcel8;
            // Change properties of the Workbook
            ExcelApp.Columns.ColumnWidth = 20;

            // Storing header part in Excel
            for (int i = 1; i < datagridview.Columns.Count + 1; i++)
            {
                ExcelApp.Cells[1, i] = datagridview.Columns[i - 1].HeaderText;
            }

            // Storing Each row and column value to excel sheet
            for (int i = 0; i < datagridview.Rows.Count; i++)
            {
                for (int j = 0; j < datagridview.Columns.Count; j++)
                {
                    if (j == 2 || j == 5)
                    {
                        ExcelApp.Cells[i + 2, j + 1] = "'" + datagridview.Rows[i].Cells[j].Value.ToString();
                    }
                    else
                    {
                        ExcelApp.Cells[i + 2, j + 1] = datagridview.Rows[i].Cells[j].Value.ToString();
                    }
                }
            }

            //Save Copy by giving file Path
            //ExcelApp.ActiveWorkbook.SaveCopyAs("C:\\" + FileName);

            //OR using SaveFileDialog
            ExcelApp.ActiveWorkbook.SaveCopyAs(sfd.FileName);

            //OR even you can use SaveAs function
            //ExcelApp.ActiveWorkbook.SaveAs(sfd.FileName, XlFileFormat.xlExcel8, null, null, null,
            // null, XlSaveAsAccessMode.xlShared, null, null, null, null, null);
            ExcelApp.ActiveWorkbook.Saved = true;
            ExcelApp.Quit();
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show("ERROR: " + ex.Message);
    }
}