MainPage.xaml

<Page
    x:Class="EncryptionDecryption.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:EncryptionDecryption"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="2*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>

            <Frame x:Name="myFrame" Grid.Row="1"/>
            <Image Source="Assets/background.jpg" Grid.Column="1" Stretch="UniformToFill"/>
            <TextBlock Text="This is a program that makes use of the AES cryptographic Algorithm to encrypt a string of text which you and only you are able to access and decrypt and only from the same device." VerticalAlignment="Center" HorizontalAlignment="Center" Grid.Column="1" TextWrapping="Wrap" TextAlignment="Center" Margin="0,0,0,0" FontSize="20" FontFamily="Microsoft Sans Serif" Foreground="White" SelectionHighlightColor="Black"/>

        </Grid>
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition Height="*" />
                <RowDefinition Height="*" />
                <RowDefinition Height="*" />
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>
            <Grid Grid.Row="0">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*"/>
                    <ColumnDefinition Width="*"/>
                    <ColumnDefinition Width="*"/>
                </Grid.ColumnDefinitions>




                <Button Grid.Column="0" Grid.Row="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Content="Encrypt" Click="Encrypt_Button_Click" Foreground="White" FontSize="20" RequestedTheme="Light" >
                    <Button.Background>
                        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                            <GradientStop Color="#FF1F1E1E" Offset="0.443"/>
                            <GradientStop Color="#FF595858" Offset="0.997"/>
                        </LinearGradientBrush>
                    </Button.Background>
                </Button>
                <Button Grid.Column="1" Grid.Row="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Content="Decrypt" Click="Decrypt_Button_Click" Foreground="White" FontSize="20" >
                    <Button.Background>
                        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                            <GradientStop Color="#FF1F1E1E" Offset="0.443"/>
                            <GradientStop Color="#FF595858" Offset="0.997"/>
                        </LinearGradientBrush>
                    </Button.Background>
                </Button>
                <Button Grid.Column="2" Grid.Row="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Content="Reset" Click="Reset_Button_Click" Foreground="White" FontSize="20" >
                    <Button.Background>
                        <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                            <GradientStop Color="#FF1F1E1E" Offset="0.443"/>
                            <GradientStop Color="#FF595858" Offset="0.997"/>
                        </LinearGradientBrush>
                    </Button.Background>
                </Button>

            </Grid>


            <StackPanel 
                Grid.Row="1"               
                HorizontalAlignment="Center"
                VerticalAlignment="Center"
                Orientation="Horizontal"
                Margin="-400,0,0,-220" >
                <TextBlock Padding="0,5,0,0" Text="Input data" Width="120" />
                <TextBox x:Name="inputData" PlaceholderText="Write a string" Height="35" Width="200"/>
            </StackPanel>

            <StackPanel 
                Grid.Row="2"
                HorizontalAlignment="Center"
                VerticalAlignment="Center"
                Orientation="Horizontal"
                Margin="-400,0,0,0" >
                <TextBlock Padding="0,5,0,0" Text="Encrypted data" Width="120" />
                <TextBox x:Name="encryptedData" IsReadOnly="True" PlaceholderText="Encrypt first" Height="35" Width="200" />
            </StackPanel>

            <StackPanel 
                Grid.Row="3"
                HorizontalAlignment="Center"
                VerticalAlignment="Center"
                Orientation="Horizontal"
                Margin="-400,-220,0,0">
                <TextBlock Padding="0,5,0,0" Text="Decrypted data" Width="120" Height="32"/>
                <TextBox x:Name="decryptedData" IsReadOnly="True" PlaceholderText="Decrypt first" Height="35" Width="200" />
            </StackPanel>
        </Grid>
    </Grid>
</Page>