private void btnXoaNhom_Click(object sender, EventArgs e)
{
string tenNhomXoa = (string)dgvNhom.CurrentCell.Value;
var nhom = Nhom.getNhomFromDBByName(tenNhomXoa);
DanhBa.xoaDanhBaByNhom(nhom.maNhom);
Nhom.xoaNhomFromDBByName(tenNhomXoa);
refreshList();
//string pathNhom = Application.StartupPath + @"/DATA/Nhom.txt";
//string pathDanhBa = Application.StartupPath + @"/DATA/DanhBa.txt";
//string[] linesNhom = File.ReadAllLines(pathNhom);
//string[] linesDanhBa = File.ReadAllLines(pathDanhBa);
//File.WriteAllText(pathNhom, "");
//File.WriteAllText(pathDanhBa, "");
//string newline = System.Environment.NewLine;
//for (int i = 0; i < linesNhom.Length; i++)
//{
// string[] temp = linesNhom[i].Split(new char[] { '#' });
// if (!temp[1].Equals(tenNhomXoa))
// {
// File.AppendAllText(pathNhom, linesNhom[i] + newline, Encoding.Unicode);
// }
//}
//for (int i = 0; i < linesDanhBa.Length; i++)
//// {
// string[] temp = linesDanhBa[i].Split(new char[] { '#' });
// if (!temp[0].Equals(tenNhomXoa))
// {
// File.AppendAllText(pathDanhBa, linesDanhBa[i] + newline, Encoding.Unicode);
// }
// }
}