//loads lists of patients and doctors who can be assigned to a visit
//but this one also adds (main) prefix to a patient's main doctor
private Visit LoadMainDoctorDDLOptions(Visit v)
{
v.PatientsList = Consts.GetPatientsDDL();
v.DoctorsList = Consts.GetDoctorsDDLWithMainDoctor(v.Patient);
return(v);
}