我可以从后面的C#代码更新WPF绑定的值吗？

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="200" Width="300">
    <Grid>
        <TextBlock Text="{Binding MyText}" />
    </Grid>
</Window>

using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Windows;

namespace WpfApp1
{
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        private string _myText;

        public event PropertyChangedEventHandler PropertyChanged;

        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
            MyText = "Hello, World!";
        }

        public string MyText
        {
            get { return _myText; }
            set
            {
                _myText = value;
                OnPropertyChanged();
            }
        }

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