private void CmdSave_Clicked(object sender, EventArgs e)
        {
            PostJump post = new PostJump()
            {
                Date         = date.Text,
                Place        = place.Text,
                Aircraft     = aircraft.Text,
                Equipment    = equipment.Text,
                FreeFallTime = freeFallTime.Text,
                FlyingType   = flyingType.Text
            };

            using (SQLiteConnection connection = new SQLiteConnection(App.DatabaseLocation)){
                connection.CreateTable <PostJump>();
                int rows = connection.Insert(post);

                if (rows > 0)
                {
                    DisplayAlert("Saved", "Jump saved", "Ok");
                }
                else
                {
                    DisplayAlert("Not saved", "Jump not saved", "Ok");
                }
            }
            // reload logbook page
            Navigation.PopAsync();
        }
        //reassign value
        public JumpDetailPage(PostJump selectedJump)
        {
            InitializeComponent();
            this.selectedJump = selectedJump;

            //jumpNumber.Text = selectedJump.JumpNumber;
            date.Text         = selectedJump.Date;
            place.Text        = selectedJump.Place;
            aircraft.Text     = selectedJump.Aircraft;
            equipment.Text    = selectedJump.Equipment;
            freeFallTime.Text = selectedJump.FreeFallTime;
            flyingType.Text   = selectedJump.FlyingType;
        }