diff --git a/MainWindow.xaml.cs b/MainWindow.xaml.cs
index 5f344b2..2384ed9 100644
--- a/MainWindow.xaml.cs
+++ b/MainWindow.xaml.cs
@@ -105,6 +105,7 @@ namespace SUNLIGHT_CDKEY
 
         private void Button_Click(object sender, RoutedEventArgs e)
         {
+
             string a;
             string b, my, mm, md;
 
@@ -117,6 +118,11 @@ namespace SUNLIGHT_CDKEY
             md = Convert.ToString(Convert.ToInt32(255-d), 16).ToUpper();
             b=my+mm+md;
 
+
+            a= sn_id.Text.Substring(0, 6);
+            b=(2255-y).ToString()+(255-m).ToString()+(255-d).ToString();
+
+
             cdk.Text = a + b + CRCcheck16.ToCRC16(CRCcheck16.StringToHexByte(b), true);
         }