INotifyPropertyChanged With Bindings

Binding_INotifyPropertyChanged.xaml.cs

using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;

namespace WPFTestApp
{
    public partial class Window1 : Window
    {
        private Main_ViewModel main_ViewModel = new Main_ViewModel();
        public Window1()
        {
            InitializeComponent();
            DataContext = main_ViewModel;
            Task Begin = new Task(() => Set_Default_Values());
            Begin.Start();
        }

        public delegate void Delegate_Callback_To(string str_Value);

        public void UpdateUI_With_NewItem(string item_Value)
        {
            myTextBlock.Text = item_Value;
        }

        private void Set_Default_Values()
        {
            myTextBlock.Dispatcher.Invoke(new Delegate_Callback_To(UpdateUI_With_NewItem), new string[] { "Nothing Detected" });
        }
        private void T0_MouseMove(object sender, MouseEventArgs e)
        {
            main_ViewModel.New_Value.TextBlock_Text = textBox0.Text;
        }
    }
    public class ObservableValue : INotifyPropertyChanged
    {
        private string TextBlock_Value;
        public string TextBlock_Text
        {
            get
            {
                if (string.IsNullOrEmpty(TextBlock_Value))
                    return "Default TextA";
                return TextBlock_Value;
            }
            set
            {
                TextBlock_Value = value;
                OnPropertyChanged();
            }
        }
        public event PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChanged([CallerMemberName] string new_Value = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(new_Value));
        }
    }
    public class Main_ViewModel
    {
        public ObservableValue New_Value { get; }
        public Main_ViewModel()
        {
            New_Value = new ObservableValue();
        }
    }
}