Clear session

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November 8th, 2006, 04:52 AM

imperialx

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Clear session

Hi,

When I release session objects I do this

Code:

session("username")=""

So whats the difference when I do this

Code:

set session("username")=nothing
or
session.remove("username")

Isn't I already release it with a null value?

November 8th, 2006, 06:17 AM

degsy

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There is a slight different between destroying a session and making it equal to nothing.

If it is equal to nothing then it does exist and use String or Len functions to compare/validate it.

Logically, if you destroy the session then is doesnot exist and you should be able to use IsNull or IsEmpty to compare/validate.

ASP VBScript is pretty lenient on some validation though.

http://www.w3schools.com/asp/met_abandon.asp
http://www.w3schools.com/asp/met_contents_remove.asp

November 8th, 2006, 04:27 PM

alexk13

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If you want to "destroy" all of your session variables you can also use:

Code:

Session.Abandon

Hope this helps

Alex

November 14th, 2006, 08:29 PM

imperialx

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Hello,

I try to Stop IIS and when I Start it again sessions and application values are still there

How do you clear all this objects in IIS? can I clear it in using IIS?

November 14th, 2006, 11:37 PM

chazzuka

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hmm it sounds impossible dude when you restart IIS Then all user define variable will be released except cookies. it make a sense because those all variables exist under the IIS service.

release session,

if you using session("sesname") = "" mean
you assign the session to have empty string value but the session variable still exist in the service.

both set session("sesname")=nothing or session.remove("sesname") are quite same.

session.abandon mean you destroy all session variables in your current service

the best way to find out if the variables is exist or not by using isEmpty not isNull

try these code:

Code:

<%
' I never declare the session("1") but isNull will return false

Response.Write "isEmpty="&isEmpty(Session("1"))&"<br>"
Response.Write "isNull="&isNull(Session("1"))&"<br>"
%>

November 15th, 2006, 12:55 AM

imperialx

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Hi chazzuka,

Oh I thought IIS can clear those objects, I guess not. Thanks!

November 15th, 2006, 01:05 AM

chazzuka

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i mean when you stop the web service all the user define variables will be lost except cookies so i think it is impossible when u restart the IIS the the session still remain

or maybe cache problem

January 25th, 2007, 09:07 AM

imperialx

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Hello,

When I now use the clear session with a value set to nothing, I receive this error

error

Quote:

Error Type:
Session object, ASP 0185 (0x80020003)
A default property was not found for the object.
/logout.asp, line 2

logout.asp

Code:

<%
		session("id")=nothing
		session("username")=nothing
		session("islogin")=nothing	
			
		response.Redirect ("index.asp")
%>

January 25th, 2007, 09:12 AM

Tukaro

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It's my understanding that you have to use "Set" when doing that, like "Set session("id") = Nothing". Give that a shot.

#10

January 25th, 2007, 09:55 AM

imperialx

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Hi Tukaro,

I have Set it and when I redirect it to another page I receive this error

Quote:

Error Type:
Response object, ASP 0185 (0x80020003)
A default property was not found for the object.
/index.asp

because there is no line number to know where the error is, I think this is where it cause it

index.asp

Code:

.
.
.
<%if isempty(session("islogin")) then%>
.
.
.

what went wrong?

#11

January 25th, 2007, 10:13 AM

imperialx

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Hello,

After setting to nothing in LOGOUT.asp from the above code how come I couldn't use this condition?

Code:

<%if isempty(session("islogin")) then
                 response.write "is empty"
             else
                 response.write "empty" <--won't show :(
             end if
%>

#12

February 14th, 2007, 06:46 AM

Munchio

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Have you tried:

Session("id") = Empty

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