Excel version I need to  transfer a datagrid to Excel in a win forms C# application

Microsoft.Office.Interop; 
private void button1_Click(object sender, EventArgs e)
        {
            Excel.ApplicationClass excel = new ApplicationClass();
 
            excel.Application.Workbooks.Add(true);
            DataTable table = DataSet2.Tables[0];
            int ColumnIndex = 0;
            foreach (Datacolumn col in table.Columns)
            {
                ColumnIndex++;
                excel.Cells[1, ColumnIndex] = col.ColumnName;
            }
            int rowIndex = 0;
            foreach (DataRow row in table.Row)
            {
                rowIndex++;
                ColumnIndex = 0;
                foreach (DataColumn col in table.Columns)
                {
                    ColumnIndex++;
                    excel.Cells[rowIndex + 1, ColumnIndex] = row.Cells[col.ColumnName].Text;
                }
            }
            excel.Visible = true;
            Worksheet worksheet = (Worksheet)excel.ActiveSheet;
            worksheet.Activate();
 
            //string strTitle = dataGridView1;
           // new DataGridExcelExporter(this.dataGridView1 , this.Page).Export(strTitle);
 
        }