protected virtual void RaisePropertyChanged <T>(Expression <Func <T> > propertyExpression)
{
if (PropertyChanged != null)
{
PropertyChangedHelper.RaisePropertyChanged(this, PropertyChanged, propertyExpression);
}
}
protected void SetProperty <T>(ref T backingField, T newValue, Expression <Func <T> > propertyExpression)
{
PropertyChangedHelper.SetProperty(this, PropertyChanged, ref backingField, newValue, propertyExpression);
}