public BanHangDAO()
{
conn = new DBConnection();
}
public LapLichDAO()
{
conn = new DBConnection();
}
public ChuyenKhoDAO()
{
conn = new DBConnection();
}
public ChiTietPhieuTraHangDAO()
{
conn = new DBConnection();
}
public TraHangDAO()
{
conn = new DBConnection();
}