What would be the best way to implement change tracking on an object

To do this you can’t really use automatic getter & setters, and you need to set IsDirty in each setter.

I generally have a “setProperty” generic method that takes a ref parameter, the property name and the new value.
I call this in the setter, allows a single point where I can set isDirty and raise Change notification events e.g.

protected bool SetProperty<T>(string name, ref T oldValue, T newValue) where T : System.IComparable<T>
    {
        if (oldValue == null || oldValue.CompareTo(newValue) != 0)
        {
            oldValue = newValue;
            PropertyChanged?.Invoke(this, new System.ComponentModel.PropertyChangedEventArgs(name));
            isDirty = true;
            return true;
        }
        return false;
    }
// For nullable types
protected void SetProperty<T>(string name, ref Nullable<T> oldValue, Nullable<T> newValue) where T : struct, System.IComparable<T>
{
    if (oldValue.HasValue != newValue.HasValue || (newValue.HasValue && oldValue.Value.CompareTo(newValue.Value) != 0))
    {
        oldValue = newValue;
        PropertyChanged?.Invoke(this, new System.ComponentModel.PropertyChangedEventArgs(name));
    }
}