2024.03.04. WPF - label, listbox, messagebox, button

Help:

https://learn.microsoft.com/en-us/dotnet/desktop/wpf/windows/how-to-open-message-box?view=netdesktop-8.0

<Window x:Class="WpfApp2_b2.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:WpfApp2_b2"

        mc:Ignorable="d"

        Title="MainWindow" Height="450" Width="800">

    <Grid>

        <Label Content="ipiapacs" HorizontalAlignment="Left" Height="37" Margin="60,37,0,0" VerticalAlignment="Top" Width="131" Background="#FF9EF99F"/>

        <Button x:Name="btn1" Content="Kattints rám!" HorizontalAlignment="Left" Height="39" Margin="73,101,0,0" VerticalAlignment="Top" Width="128" Click="btn1_Click"  />

        <ListBox x:Name="lbx1" HorizontalAlignment="Left" Height="116" Margin="260,56,0,0" VerticalAlignment="Top" Width="122">

            <ListBoxItem>Hétfő</ListBoxItem>

            <ListBoxItem>Kedd</ListBoxItem>

            <ListBoxItem>Szerda</ListBoxItem>

        </ListBox>

        <Label x:Name="lblGombEredmeny" Content="" HorizontalAlignment="Left" Height="30" Margin="73,149,0,0" VerticalAlignment="Top" Width="163"/>

    </Grid>

</Window>

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

namespace WpfApp2_b2

{

    /// <summary>

    /// Interaction logic for MainWindow.xaml

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

            lbx1.Items.Add("Csütörtök");

            lbx1.Items.Add("Péntek");

            lbx1.Items.Add("Szombat");

            lbx1.Items.Add("Vasárnap");

        }

        private void btn1_Click(object sender, RoutedEventArgs e)

        {

            MessageBoxResult eredmeny = MessageBox.Show("Sajnos hétfő van","Ablak címe",MessageBoxButton.YesNoCancel,MessageBoxImage.Error,MessageBoxResult.OK);

            if (eredmeny == MessageBoxResult.Yes)

            {

                lblGombEredmeny.Content = "Jó válasz!";

            }

            else

            {

                if (eredmeny == MessageBoxResult.No)

                {

                    lblGombEredmeny.Content = "Rossz válasz!";

                }

                else

                {

                    lblGombEredmeny.Content = "Nade miért léptél ki?";

                }

            }

        }

    }

} 

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