ConfirmationMessageBox.xaml

<Window x:Class="ContactManagerApp1.ConfirmationMessageBox"
        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:ContactManagerApp1"
        mc:Ignorable="d"
        Title="Confirmation Message Box" Height="450" Width="800">
    <Grid>
        <TextBlock Text="Are you sure you want to delete this contact?" 
                   HorizontalAlignment="Center" 
                   VerticalAlignment="Center" 
                   TextWrapping="Wrap" 
                   Margin="10" FontSize="35" FontWeight="Bold"/>
        <StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Bottom" Margin="10">
            <Button Content="Yes" Margin="5" Width="75" Height="30" Click="YesButton_Click" FontWeight="Bold"/>
            <Button Content="No" Margin="5" Width="75" Height="30" Click="NoButton_Click" FontWeight="Bold"/>
        </StackPanel>
    </Grid>
</Window>