public partial class MainWindow : Window, INotifyPropertyChanged
        {
            private ObservableCollection<ShortlistedClient> datas = new ObservableCollection<ShortlistedClient>();
            public ObservableCollection<ShortlistedClient> Datas
            {
                get { return datas; }
                set
                {
                    if (datas != value)
                    {
                        datas = value;
                        NotifyPropertyChanged("Selected");
                    }
                }
            }
            private ShortlistedClient selected;
            public ShortlistedClient Selected
            {
                get { return selected; }
                set
                {
                    if (selected != value)
                    {
                        selected = value;
                        NotifyPropertyChanged("Selected");
                    }
                }
            }
            public MainWindow()
            {
                InitializeComponent();
                Datas.Add(new ShortlistedClient() { DT = DateTime.Now });
                Datas.Add(new ShortlistedClient() { DT = DateTime.Now });
                Datas.Add(new ShortlistedClient() { DT = DateTime.Now });
                DataContext = this;
            }
            public event PropertyChangedEventHandler? PropertyChanged;
            protected void NotifyPropertyChanged([CallerMemberName] string name = null)
            {
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
            }
    
            private void addInterviewTime(object sender, RoutedEventArgs e)
            {
                CultureInfo enUS = new CultureInfo("en-US");
    
                if (Selected != null)
                {
                     if( DateTime.TryParseExact(textBox.Text, "hh:mm", CultureInfo.InvariantCulture, DateTimeStyles.None, out DateTime result))
                    {
                       // 09:00
                        //  12 / 12 / 2022 2:11:22 PM
                        Selected.DT = result;
                    }
                 
                }
            }
        }
    
        public class ShortlistedClient :  INotifyPropertyChanged
        {
            private DateTime? _dt;
    
            public DateTime? DT
            {
                get { return _dt; }
                set { _dt = value; NotifyPropertyChanged(); }
            }
            public bool InterestedinVac { get; private set; }
    
            public List<ShortlistedClient> clients { get; set; } = new List<ShortlistedClient>();
            public ShortlistedClient() { InterestedinVac = true; }
        
            public event PropertyChangedEventHandler PropertyChanged;
            protected void NotifyPropertyChanged([CallerMemberName] string name = null)
            {
                PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
            }
        }