public DBQLPhongHocMayTinhDataContext getDatacontext()
{
String strKetNoi = @"Data Source=DESKTOP-RFV2GND;Initial Catalog=QuanLyPhongMay;Integrated Security=True";
dt = new DBQLPhongHocMayTinhDataContext(strKetNoi);
dt.Connection.Open();
return(dt);
}
public clsPhongHoc()
{
dt = getDatacontext();//ở lớp cha
}
public clsMayTinh()
{
dt = getDatacontext();//o lop cha
}
