從Dev GridView導出Excel

        public void Button5_Click(object sender, EventArgs e)
        {
            SaveFileDialog fbd = new SaveFileDialog();
            fbd.Title = "選擇路徑";//窗體標題
            fbd.Filter = "Excel文件(.xls)|*.xls";//文件類型          
            //fbd.Description = "選擇一個文件夾";

            if (fbd.ShowDialog() == DialogResult.OK)
            {
                string fileName = fbd.FileName;//帶路徑的文件名
                this.gvStaff.ExportToExcelOld(fileName);
            }
        }