public void Insert(TinhDiem td)
{
StreamWriter sw = File.AppendText(filetxt);
sw.WriteLine();
sw.Write(td.Mahs + "#" + td.Hocky + "#" + td.Diemtb);
sw.Close();
}
public void themdiem(TinhDiem td)
{
if (td.Mahs != "" && td.Hocky != "")
{
tdDA.Insert(td);
}
else
{
throw new Exception("Du lieu sai");
}
}
