public AvailableBloodSampleDal()
{
_dao = new dao();
}
public BloodRequestDal()
{
_dao = new dao();
}
public ReceiverDal()
{
_dao = new dao();
}
public HospitalDal()
{
_dao = new dao();
}
public BloodSampleDal()
{
_dao = new dao();
}