✅ How can I make my code reusable?

   public class AverageViewModel : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        public double TextBox1Value
        {
            get { return textBox1Value; }
            set
            {
                textBox1Value = value;
                CalculateAverage();
                OnPropertyChanged();
            }
        }

        // Define properties for TextBox2Value, TextBox3Value, TextBox4Value, TextBox5Value, and Average similarly.

        private void CalculateAverage()
        {
            Average = (TextBox1Value + TextBox2Value + TextBox3Value + TextBox4Value + TextBox5Value) / 5.0;
        }

        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }