public bool UpdateTreatment(Treatment treatment)
{
Treatment treatment1 = Treatments.SingleOrDefault(tr => tr.Id == treatment.Id);
if (treatment1 == null)
{
return(false);
}
treatment1.Name = treatment.Name;
treatment1.Duration = treatment.Duration;
treatment1.Price = treatment.Price;
treatment1.Category = treatment.Category;
return(true);
}