Lab13/OpenAndSaveDialogFile/MainWindow.xaml

<Window x:Class="OpenAndSaveDialogFile.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:OpenAndSaveDialogFile"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800" WindowStartupLocation="CenterScreen" Loaded="Window_Loaded">
    <Border>
        <Border Background="LightGray" CornerRadius="20" Margin="10">
            <Grid>
                <StackPanel Margin="20" HorizontalAlignment="Center" VerticalAlignment="Top">
                    <TextBox x:Name="QuestionOutput" Background="White" Height="200" Width="700" TextWrapping="Wrap" FontSize="20" IsReadOnly="True"/>
                    <TextBox x:Name="AnswerInput" Margin="0,30,0,0" FontSize="20" Height="40"/>
                </StackPanel>
                <StackPanel Orientation="Horizontal" VerticalAlignment="Bottom" HorizontalAlignment="Center" Margin="0,0,0,40">
                    <Button Click="btnSave_Click" Height="40" Width="200" Content="Сохранить результат" Margin="5"/>
                    <Button Click="btnNext_Click" Height="40" Width="200" Content="Далее" Margin="5"/>
                </StackPanel>
            </Grid>
        </Border>
    </Border>
</Window>