BestFriend.MainPage.TextBox_KeyDown C# (CSharp) Метод

        private void TextBox_KeyDown(object sender, KeyRoutedEventArgs e)
        {
            TextBox box = (TextBox)sender;
            if (e.Key == Windows.System.VirtualKey.Enter && !string.IsNullOrWhiteSpace(box.Text))
            {
                SendMessage(box.Text);
                box.Text = "";

            }
        }
        #endregion