private void exportExcel_button_Click(object sender, EventArgs e)
 {
     ExportExcel exportExcel = new ExportExcel();
     exportExcel.Save("category");
 }
 private void button1_Click(object sender, EventArgs e)
 {
     ExportExcel exportExcel = new ExportExcel();
     exportExcel.Save("person");
 }
 private void exportExcel_Button_Click(object sender, EventArgs e)
 {
     ExportExcel exportExcel = new ExportExcel();
     exportExcel.Save("vendor");
 }