diff --git a/solarApp/fmArchive.cs b/solarApp/fmArchive.cs
index 39826eb..119c1c1 100644
--- a/solarApp/fmArchive.cs
+++ b/solarApp/fmArchive.cs
@@ -9,6 +9,7 @@ using System.Text;
 using System.Windows.Forms;
 using solarApp.Service;
 using solarApp.Model;
+//using System.Text.RegularExpressions;
 
 namespace solarApp
 {
@@ -699,5 +700,24 @@ namespace solarApp
             autoTask = false;
             lbMsgTitle.Text = System.DateTime.Now.ToString() + " invdayhour - 完成！";
         }
+
+        //test for email format
+        //private void button3_Click(object sender, EventArgs e)
+        //{
+        //    if(IsValidEmail(textBox2.Text))
+        //    {
+        //        label3.Text = "OK";
+        //    }
+        //    else
+        //    {
+        //        label3.Text = "X";
+        //    }
+        //}
+
+        //bool IsValidEmail(string strIn)
+        //{
+        //    // Return true if strIn is in valid e-mail format.
+        //    return Regex.IsMatch(strIn, @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");
+        //}
     }
 }