public class ViewModel : INotifyPropertyChanged
{
    private Model _model=new Model("BlaBlaBla");
    public string ModelName
    {
        get { return _model.ModelName; }
        set
        {
            _model.ModelName = value;
            OnPropertyChanged("ModelName");
        }
    }
 protected virtual void OnPropertyChanged(string propertyName)
    {
        var handler = PropertyChanged;
        if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
    }
}

  class Model
{
    public string ModelName { get; set; }

    public Model(string name){
        ModelName=name
    }
}

private Model _model = new Model("BlaBlaBla");

public Model(string name)
{
    ModelName=name
}