private void btn_delete_Cl(object sender, EventArgs e) { //This one is for deletion operation int index = comboBox2.SelectedIndex; if (index >= 0) { //WE need to call the index value as well as send the id parameter //This will delete the value form both the comfortDetail and chartcomfortzonesetting table. DialogResult dialogResult = MessageBox.Show("are you sure you want to delete :" + bs.listComfortZoneDetail[index].name, "Delete", MessageBoxButtons.YesNo); if (dialogResult == DialogResult.Yes) { bs.DeleteComfortZoneData(bs.listComfortZoneDetail[index].id); MessageBox.Show("value deleted successfully"); //Refresh the values refreshAfterEdit(); } } }