Вывести текст в TextBlock

public MainWindow()
        {
            InitializeComponent();
 
            StackPanel sp = new StackPanel();
            sp.Orientation = System.Windows.Controls.Orientation.Horizontal;
            sp.HorizontalAlignment = System.Windows.HorizontalAlignment.Stretch;
            sp.VerticalAlignment = System.Windows.VerticalAlignment.Center;
 
            TextBlock textBlock2 = new TextBlock();
 
            textBlock2.Text = "Скачивание списка md5 файлов сервера, так как он старый";
            sp.Children.Add(textBlock2);
        }

 protected void RaisePropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

protected void RaisePropertyChanged(string propName)
{
    if (PropertyChanged != null)
    {
        PropertyChanged(this, new PropertyChangedEventArgs(propName);
    }
}

 protected void RaisePropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

protected void RaisePropertyChanged(string propName)
{
    if (PropertyChanged != null)
    {
        PropertyChanged(this, new PropertyChangedEventArgs(propName);
    }
}

RaisePropertyChanged("MyProp");
// или
RaisePropertyChanged(nameof(MyProp));

        protected void RaisePropertyChanged([CallerMemberName] string propertyName = null)
        {
            var propertyChanged = PropertyChanged;
            if(propertyChanged != null)
                propertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }

public string WorkTypeName
{
    get => _workTypeName;
    set
    {
        if (value != _workTypeName)
        {
            _workTypeName = value;
            OnPropertyChanged(nameof(WorkTypeName));
        }
    }
}