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 }