ASP Cookies Example Tutorial

Want to use cookies to record whether the current user has just posted,
Myvar=request.cookies ("StartTime")
If myvar= "" Then

Response.Cookies ("StartTime") =time ()
Response.Cookies ("StartTime"). Expires=dateadd ("n", 1,now ())
Else
Response. Write ("You submit the information frequency too fast, please submit the next article in 15 minutes")
Response.End
End If
Why doesn't it work, what's wrong?

Myvar=request.cookies ("StartTime")
If myvar= "" then "if empty, it proves that the user did not come to the page

Response.Cookies ("StartTime") =time () ' The session ("StartTime") is not empty
Response.Cookies ("StartTime"). Expires=dateadd ("n", 1,now ()) ' Set cookie retention time to one minute
Else
Response. Write ("You Came here one minute, please come back later")
Response.End
End If