diff --git a/Lotto_Wpf/Lotto_Wpf/MainWindow.xaml.cs b/Lotto_Wpf/Lotto_Wpf/MainWindow.xaml.cs
index 59d66f2..80d93e6 100644
--- a/Lotto_Wpf/Lotto_Wpf/MainWindow.xaml.cs
+++ b/Lotto_Wpf/Lotto_Wpf/MainWindow.xaml.cs
@@ -1,24 +1,46 @@
 using System.Text;
 using System.Windows;
 using System.Windows.Controls;
-using System.Windows.Data;
-using System.Windows.Documents;
-using System.Windows.Input;
+using System.Collections.Generic;
+using System.Windows;
+using System.Windows.Controls;
 using System.Windows.Media;
-using System.Windows.Media.Imaging;
-using System.Windows.Navigation;
-using System.Windows.Shapes;
 
-namespace test_4
+namespace LottoNumberBoard
 {
-    /// <summary>
-    /// Interaction logic for MainWindow.xaml
-    /// </summary>
     public partial class MainWindow : Window
     {
+        private HashSet<int> selectedNumbers = new();
+
         public MainWindow()
         {
             InitializeComponent();
         }
+
+        private void NumberButton_Click(object sender, RoutedEventArgs e)
+        {
+            if (sender is Button btn && int.TryParse(btn.Content.ToString(), out int number))
+            {
+                if (selectedNumbers.Contains(number))
+                {
+                    selectedNumbers.Remove(number);
+                    btn.ClearValue(Button.BackgroundProperty);
+                }
+                else
+                {
+                    selectedNumbers.Add(number);
+                    btn.Background = Brushes.LightGreen;
+                }
+
+                UpdateResultDisplay();
+            }
+        }
+
+        private void UpdateResultDisplay()
+        {
+            var sorted = new List<int>(selectedNumbers);
+            sorted.Sort();
+            ResultTextBlock.Text = string.Join(", ", sorted);
+        }
     }
-}
\ No newline at end of file
+}