تهیه خروجی از دیتاگریدویو سی شارپ

 _Application app = new Microsoft.Office.Interop.Excel.Application();
            _Workbook workbook = app.Workbooks.Add(Type.Missing);
            _Worksheet worksheet = null;
            app.Visible = true;
            worksheet = (Worksheet)workbook.Sheets["Sheet1"];
            worksheet = (Worksheet)workbook.ActiveSheet;
            worksheet.Name = "Exported from gridview";
            for (int i = 1; i < dataGridView1.Columns.Count + 1; i++)
            {
                worksheet.Cells[1, i] = dataGridView1.Columns[i - 1].HeaderText;
            }
            for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
            {
                for (int j = 0; j < dataGridView1.Columns.Count; j++)
                {
                    worksheet.Cells[i + 2, j + 1] = dataGridView1.Rows[i].Cells[j].Value.ToString();
                }
             }
          SaveFileDialog sfd = new SaveFileDialog();
            sfd.Filter = "Excel Document(*.xlsx)|*.xlsx";
          if (sfd.ShowDialog() == DialogResult.OK)
            {
                workbook.SaveAs(sfd.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();