MainWindow.xaml

<Window x:Class="IncomeOutcomeLockAndSynchronised.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:IncomeOutcomeLockAndSynchronised"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <TextBox Name ="IncomeBox" TextWrapping="Wrap" Text="TextBox" Margin="239,163,238,229"/>
        <Button Content="Calculate" HorizontalAlignment="Left" Margin="275,217,0,0" VerticalAlignment="Top" Width="227" Click="Button_Click"/>
        <TextBlock Name ="TimeBlock" HorizontalAlignment="Left" Margin="239,130,0,0" TextWrapping="Wrap" Text="TextBlock" VerticalAlignment="Top" Width="226"/>
        <ComboBox x:Name="comboBox" HorizontalAlignment="Left" Margin="239,69,0,0" VerticalAlignment="Top" Width="142" Height="26" IsReadOnly="True" BorderBrush="White" Text="Select Type..." SelectedIndex="0">
            <ComboBoxItem Content="Lock Mode"/>
            <ComboBoxItem Content="TPL Mode"/>
        </ComboBox>

    </Grid>
</Window>