MainWindow.xaml

<Window x:Class="AsyncIncomeOutcome.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:AsyncIncomeOutcome"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <TextBox Name="TextBox"  HorizontalAlignment="Center" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="192" Height="40" Margin="0,177,0,0"/>
        <Button Name="Button" Content="Calculate" HorizontalAlignment="Left" Margin="344,251,0,0" VerticalAlignment="Top" Width="119" Click="Button_Click"/>
        <Label Name="StopwatchLabel" Content="Time Elapsed:" HorizontalAlignment="Center" Margin="0,124,0,0" VerticalAlignment="Top" Width="192"/>

    </Grid>
</Window>