UWP - Rectangle example

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="StackPanel1" 
        Margin="50" 
        Orientation="Vertical"
        Background="AliceBlue"
        Padding="50"
        >
        <Rectangle
            Width="300"
            Height="100"
            Fill="PaleGreen"
            Margin="5"
            />
        <Rectangle
            Width="300"
            Height="100"
            Stroke="Black"
            StrokeThickness="5"
            Margin="5"
            />
        <Rectangle
            Width="300"
            Height="100"
            Fill="Crimson"
            Stroke="Yellow"
            StrokeThickness="3"
            Margin="5"
            />
        <Rectangle
            Width="300"
            Height="100"
            Fill="Pink"
            Stroke="CadetBlue"
            StrokeThickness="2"
            Margin="5"
            RadiusX="50"
            RadiusY="50"
            />
        <Rectangle
            Width="300"
            Height="100"
            Fill="Honeydew"
            Stroke="BlueViolet"
            StrokeThickness="5"
            Margin="5"
            RadiusX="10"
            RadiusY="45"
            />
    </StackPanel>
</Page>

MainPage.xaml.cs

using Windows.UI.Xaml.Controls;
using Windows.UI;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Shapes;


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

            // Create a rectangle
            CreateRectangle();
        }

        private void CreateRectangle()
        {
            // Initialize a new rectangle instance
            Rectangle rectangle = new Rectangle();

            // Set the rectangle height and width
            rectangle.Height = 100;
            rectangle.Width = 300;

            // Fill the rectangle with a solid color
            rectangle.Fill = new SolidColorBrush(Colors.Blue);

            // Set the rectangle border color
            rectangle.Stroke = new SolidColorBrush(Colors.LightSeaGreen);

            // Set rectangle border thickness/width
            rectangle.StrokeThickness = 5;

            // Finally, add the rectangle to layout
            StackPanel1.Children.Add(rectangle);
        }
    }
}