UWP - Remove control programmatically

MainPage.xaml

<Page
    x:Class="UniversalAppTutorials.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:UniversalAppTutorials"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <StackPanel 
        x:Name="stack_panel1" 
        Margin="100" 
        Orientation="Vertical"
        >
        <TextBlock
            x:Name="text_block1"
            Text="Remove this text block by clicking the button."
            TextWrapping="WrapWholeWords"
            Foreground="Red"
            FontSize="30"
            Margin="20"
            />
        <Button
            x:Name="button_1"
            Content="Remove TextBlock"
            Click="Button1_Click"
            />
    </StackPanel>
</Page>
MainPage.xaml.cs

using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;


namespace UniversalAppTutorials
{
    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();

        }

        private void Button1_Click(object sender, RoutedEventArgs e) {
            // Find and remove the text block from stack panel
            stack_panel1.Children.Remove((UIElement)this.FindName("text_block1"));
        }
    }
}