MainWindow.xaml

<Window x:Class="RunCPython.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:RunCPython"
        mc:Ignorable="d"
        Title="MainWindow" Height="301.091" Width="262.808">
    <Grid Margin="0,0,2,0">
        <TextBox x:Name="txtBox" HorizontalAlignment="Left" Height="87" Margin="59,10,0,0" TextWrapping="Wrap" Text=""  VerticalAlignment="Top" Width="179"/>
        <TextBox x:Name="txtBoxOutput" HorizontalAlignment="Left" Height="87" Margin="59,108,0,0" TextWrapping="Wrap" Text=""  VerticalAlignment="Top" Width="179"/>
        <Button x:Name="btnRun" Content="Run script" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="157,240,0,0" Click="btnRun_Click"/>
        <CheckBox x:Name="chkBox" Content="Receive output" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="59,215,0,0"/>
        <Label Content="Input" HorizontalAlignment="Left" Margin="10,47,0,0" VerticalAlignment="Top"/>
        <Label Content="Output" HorizontalAlignment="Left" Margin="10,135,0,0" VerticalAlignment="Top"/>
    </Grid>
</Window>