2024.03.01. WPF - label, button, messagebox

 <Window x:Class="WpfApp2.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"

        mc:Ignorable="d"

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

    <Grid >

        <Label Content="ipiapacs" HorizontalAlignment="Left" Margin="47,41,0,0" VerticalAlignment="Top" Width="121" Height="38"/>

        <Label Content="dongdiridong" HorizontalAlignment="Left" Margin="47,119,0,0" VerticalAlignment="Top"/>

        <Button x:Name="btn1" Content="Kattints rám" HorizontalAlignment="Left" Margin="57,198,0,0" VerticalAlignment="Top" Height="44" Width="157" Background="#FF2F6EC3"/>

        <ListBox x:Name="lbx1" HorizontalAlignment="Left" Height="127" Margin="344,41,0,0" VerticalAlignment="Top" Width="141">

            <ListBoxItem>Hétfő</ListBoxItem>

            <ListBoxItem>Kedd</ListBoxItem>

            <ListBoxItem>Szerda</ListBoxItem>

        </ListBox>

        <Button x:Name="btn2" Content="Ide kattints!" HorizontalAlignment="Left" Height="35" Margin="308,198,0,0" VerticalAlignment="Top" Width="138" Click="btn2_Click"/>

    </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

{

    /// <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 btn2_Click(object sender, RoutedEventArgs e)

        {

            MessageBox.Show("Hello World!","Üzenet",MessageBoxButton.YesNoCancel,MessageBoxImage.Error,MessageBoxResult.OK);

        }

    }

}