private void delbtn_Click(object sender, EventArgs e) { //kiem tra user co chon hang de xoa hay ko if (this.dataNV.SelectedRows.Count <= 0) { return; } if (NhanVienController.DeleteNV(this.txtmanv.Text.Trim()) == false) { MessageBox.Show("Loi khi xoa nhan vien", "Loi", MessageBoxButtons.OK, MessageBoxIcon.Error); return; } ShowData(); }