[Code snippet] INotifyPropertyChanged in the model and subscribed the PropertyChanged event of the model in ViewModel

internal class Model:INotifyPropertyChanged
    {
        public Model()
        {
        }

        string _FirstName = "Shahir";
        public string FirstName
        {
            get { return _FirstName; }
            set
            {
                _FirstName = value;
                OnPropertyChanged();
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        private void OnPropertyChanged([CallerMemberName] string propertyName = "")
        {
            if(PropertyChanged!=null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }

internal class MyViewModel:INotifyPropertyChanged
    {
        private Model myModel;

        public MyViewModel(Model model)
        {
            this.myModel = model;
            myModel.PropertyChanged += myModel_PropertyChanged;
        }


        public event PropertyChangedEventHandler PropertyChanged;

        private void OnPropertyChanged([CallerMemberName] string propertyName = "")
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }


        string _FirstName;
        public string MyFirstName
        {
            get { return myModel.FirstName; }
            set
            {
                _FirstName = value;
                OnPropertyChanged();
            }
        }

        private void myModel_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
        {
            if (e.PropertyName == "FirstName")
            {
                MyFirstName = myModel.FirstName;
            }
        }
    }

REFERECE - https://www.codeproject.com/Questions/1055820/How-the-Model-changes-could-be-notified-to-ViewMod