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ASP Cookies

I have inserted this code in the middle of an ASP script:

Response.Cookies("UserId") = User
Response.Cookies("UserId").Expires = Date + 30
Response.Cookies("UserId").Domain = "www.mydomain.com"
Response.Cookies("UserId").Path = "/"
Response.Cookies("UserId").Secure = TRUE

I haven't figured out why but it is giving me this error:

Response object error 'ASP 0156 : 80004005'
Header Error
/Scripts/default.asp, line 104

The HTTP headers are already written to the client browser. Any HTTP header modifications must be made before writing page content.

Does anyone know what could be causing this ?
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1 Solution
When you write a cookie in ASP, you must do that BEFORE any other HTML-output. So at the top of the page.
AnitaPAuthor Commented:
ok. If I put my cookie at the begining of my default.asp page then isn't it going to change everytime the client comes back to that same page or reloads it ?

What I mean is If I put this at the begining of my default.asp page :

User = Session.sessionID & now()

and then I access this page (default.asp) through another page, my Session("UserID") will contain another value. how can I prevent my session("UserID") from changing ?

The only time that I need to assign a new value is when the client accesses default.asp for the first time and in my last .asp file.
Then use the global.asa for that

Sub Session_OnStart
 Session("UserId") = ....
End Sub

Sub Session_OnEnd
 Session("UserId") = ...
End Sub

The global.asa is always processed when an asp is called from that application.

AnitaPAuthor Commented:
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