Does this public get set for a private variable make sense?

Question

I am working on a codebase a student with questionable knowledge made, here I am just confused if there is any reasonable intend there or if its just unnecessary... I personally would just use the ShowNewButton field and trash the _showNewBtn, please provide an opinion.

private _showNewBtn;
public bool ShowNewButton
        {
            get => _showNewBtn;
            set
            {
                bbNew.Visibility = value == false ? BarItemVisibility.Never : BarItemVisibility.Always;

                _showNewBtn = value;
            }
        }

Answer 1

I see no reason (in the sample you provided) for the _showNewBtn. You now have 2 markers which contain the visibility state of the button. At some point, this will cause problems if you aren't carefull. Either remove the _showNewBtn completely:

public bool ShowNewButton
{
  get => bbNew.Visibility == BarItemVisibility.Always;
  set
  {
    bbNew.Visibility = value == false ? BarItemVisibility.Never : BarItemVisibility.Always;
  }
}

Or justify the existance of _showNewBtn which makes my remark null and void.