added comments and wpf base

karnaugh-map/WPF-kmap/WPF-kmap/MainWindow.xaml.cs

@@ -0,0 +1,57 @@
+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 WPF_kmap
+{
+    /// <summary>
+    /// Interaction logic for MainWindow.xaml
+    /// </summary>
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            InitializeComponent();
+
+        }
+        private void boxOnClick(object sender, RoutedEventArgs e)
+        {
+            Button btn = sender as Button;
+            if (btn == null)
+                return;
+
+            int currentValue = 0;
+            if (btn.Tag != null)
+            {
+                currentValue = (int)btn.Tag;
+            }
+            else
+            {
+                if (btn.Content.ToString() == "X")
+                    currentValue = -1;
+                else if (!int.TryParse(btn.Content.ToString(), out currentValue))
+                    currentValue = 0;
+            }
+
+            int newValue;
+            if (currentValue == -1)
+                newValue = 0;
+            else if (currentValue == 0)
+                newValue = 1;
+            else
+                newValue = -1;
+
+            btn.Tag = newValue;
+            btn.Content = newValue == -1 ? "X" : newValue.ToString();
+        }
+
+
+    }
+}