diff --git a/MainWindow.xaml.cs b/MainWindow.xaml.cs
index 833d190..1eb47f7 100644
--- a/MainWindow.xaml.cs
+++ b/MainWindow.xaml.cs
@@ -43,29 +43,38 @@ namespace SUNLIGHT_CDKEY
 
         private void Tb_KeyFloating_D(object sender, TextCompositionEventArgs e)//输入事件
         {
-            d = int.Parse(T_D.Text);
             //Regex re = new Regex("[^0-9.-]+");
             Regex re = new Regex(@"^[.][0-9]+$|^[0-9]*[.]{0,1}[0-9]*$");// 非负浮点数
             e.Handled = !re.IsMatch(e.Text);
-            if(d>30)T_D.Text = "30";
+            d = int.Parse(T_D.Text);
+            if (d > 30) 
+            { 
+                T_D.Text = "30"; 
+            }
         }
 
         private void Tb_KeyFloating_Y(object sender, TextCompositionEventArgs e)//输入事件
         {
-            y = int.Parse(T_Y.Text);
             //Regex re = new Regex("[^0-9.-]+");
             Regex re = new Regex(@"^[.][0-9]+$|^[0-9]*[.]{0,1}[0-9]*$");// 非负浮点数
             e.Handled = !re.IsMatch(e.Text);
-            if (y > 2099) T_Y.Text = "2099";
+            y = int.Parse(T_Y.Text);
+            if (y > 2099)
+            {
+                T_Y.Text = "2099";
+            }
         }
 
         private void Tb_KeyFloating_M(object sender, TextCompositionEventArgs e)//输入事件
-        {
-            m = int.Parse(T_M.Text);
+        {          
             //Regex re = new Regex("[^0-9.-]+");
             Regex re = new Regex(@"^[.][0-9]+$|^[0-9]*[.]{0,1}[0-9]*$");// 非负浮点数
             e.Handled = !re.IsMatch(e.Text);
-            if (m > 12) T_M.Text = "12";
+            m = int.Parse(T_M.Text);
+            if (m > 12)
+            {
+                T_M.Text = "12";
+            }
         }
 
         private void DURATION_DropDownClosed(object sender, EventArgs e)
@@ -101,6 +110,8 @@ namespace SUNLIGHT_CDKEY
             else if (DURATION.Text == "FOREVER") 
             {
                 y = 2099;
+                m = 12;
+                d = 30;
             }
             if (m > 12)
             {
@@ -118,6 +129,10 @@ namespace SUNLIGHT_CDKEY
             string a;
             string b, my, mm, md;
 
+            d = int.Parse(T_D.Text);
+            y = int.Parse(T_Y.Text);
+            m = int.Parse(T_M.Text);
+
             sn_id.Text = sn_id.Text.ToUpper();
 
             if (sn_id.Text.Length < 6)//id字节长度大于6有效
@@ -134,10 +149,10 @@ namespace SUNLIGHT_CDKEY
        
             my = Convert.ToString(Convert.ToInt32(2255 - y), 16).ToUpper();
             mm = Convert.ToString(Convert.ToInt32(255 - m), 16).ToUpper();
-            md = Convert.ToString(Convert.ToInt32(255-d), 16).ToUpper();
+            md = Convert.ToString(Convert.ToInt32(255 - d), 16).ToUpper();
             b=my+mm+md;
 
-            cdk.Text = a + b + CRCcheck16.ToCRC16(CRCcheck16.StringToHexByte(b), true);
+            cdk.Text = a + b + CRCcheck16.ToCRC16(CRCcheck16.StringToHexByte(a+b), true);
         }
 
     }