Some ASP.NET applications use Session Variables extensively to maintain
state.
These should be re-written to use viewstate, hidden fields, querystring,
etc. instead.
This is because if a user opens a new IE window with Ctrl-N or
File-New-Window, BOTH WINDOWS SHARE THE SAME SESSION VARIABLES. This cannot
be prevented.
This means that if you change the value of a session variable in the second
window, it is also changed in the first window.
Session variables should only be used if this behavior is recognized and
compensated for.
I inherited a VB6 web class application which uses session variables
extensively. Users told me that sometimes orders were being added for the
wrong customer. I found that this occured when they opened a second browser
using Ctrl-N, changed the customer in the new window, and then returned to
the first window to add an order. They didn't realize that the customer
displayed in the first window was no longer consistent with the customer ID
stored in the shared CustomerID session variable.
26  3613 
This is a long known issue. If a new browser is pulled from the old browser,
both have the same name, which means they share session. You can prevent
this by checking user input and ensuring you are dealing with the same
record. It is more a practices problem than a session problem.
On the other hand, I agree that you should keep page specific stuff in the
page. ViewState is a good option here.
--
Gregory A. Beamer
MVP; MCP: +I, SE, SD, DBA http://gregorybeamer.spaces.live.com
*************** *************** *************** ****
Think outside of the box!
*************** *************** *************** ****
"BillE" <be****@datamti .comwrote in message
news:Oo******** ******@TK2MSFTN GP02.phx.gbl...
Some ASP.NET applications use Session Variables extensively to maintain
state.
These should be re-written to use viewstate, hidden fields, querystring,
etc. instead.
This is because if a user opens a new IE window with Ctrl-N or
File-New-Window, BOTH WINDOWS SHARE THE SAME SESSION VARIABLES. This
cannot be prevented.
This means that if you change the value of a session variable in the
second window, it is also changed in the first window.
Session variables should only be used if this behavior is recognized and
compensated for.
I inherited a VB6 web class application which uses session variables
extensively. Users told me that sometimes orders were being added for the
wrong customer. I found that this occured when they opened a second
browser using Ctrl-N, changed the customer in the new window, and then
returned to the first window to add an order. They didn't realize that
the customer displayed in the first window was no longer consistent with
the customer ID stored in the shared CustomerID session variable.
"Cowboy (Gregory A. Beamer)" <No************ @comcast.netNoS pamMwrote in
message news:ei******** ********@TK2MSF TNGP05.phx.gbl. ..
On the other hand, I agree that you should keep page specific stuff in the
page. ViewState is a good option here.
That's just common sense, surely...?
I think that the only way to ensure you are dealing with the same record is
to avoid session variables.
For example, if you are using Master pages, as far as I can tell, this means
that a customer ID must be passed by query string for GET requests, and by
hidden fields for POST requests when a new child page is being called.
Is this an accurate statement?
Thanks
-Bill
"Cowboy (Gregory A. Beamer)" <No************ @comcast.netNoS pamMwrote in
message news:ei******** ********@TK2MSF TNGP05.phx.gbl. ..
This is a long known issue. If a new browser is pulled from the old
browser, both have the same name, which means they share session. You can
prevent this by checking user input and ensuring you are dealing with the
same record. It is more a practices problem than a session problem.
On the other hand, I agree that you should keep page specific stuff in the
page. ViewState is a good option here.
--
Gregory A. Beamer
MVP; MCP: +I, SE, SD, DBA
http://gregorybeamer.spaces.live.com
*************** *************** *************** ****
Think outside of the box!
*************** *************** *************** ****
"BillE" <be****@datamti .comwrote in message
news:Oo******** ******@TK2MSFTN GP02.phx.gbl...
>Some ASP.NET applications use Session Variables extensively to maintain
state.
These should be re-written to use viewstate, hidden fields, querystring,
etc. instead.
This is because if a user opens a new IE window with Ctrl-N or
File-New-Window, BOTH WINDOWS SHARE THE SAME SESSION VARIABLES. This
cannot be prevented.
This means that if you change the value of a session variable in the
second window, it is also changed in the first window.
Session variables should only be used if this behavior is recognized and
compensated for.
I inherited a VB6 web class application which uses session variables
extensively. Users told me that sometimes orders were being added for
the wrong customer. I found that this occured when they opened a second
browser using Ctrl-N, changed the customer in the new window, and then
returned to the first window to add an order. They didn't realize that
the customer displayed in the first window was no longer consistent with
the customer ID stored in the shared CustomerID session variable.
"BillE" <be****@datamti .comwrote in message
news:%2******** **********@TK2M SFTNGP03.phx.gb l...
For example, if you are using Master pages, as far as I can tell, this
means that a customer ID must be passed by query string for GET requests,
and by hidden fields for POST requests when a new child page is being
called.
Is this an accurate statement?
Not im my experience - I use ViewState all the time within ContentPages...
Do your content pages initially receive parameters from query strings or
hidden fields?
"Mark Rae" <ma**@markNOSPA Mrae.comwrote in message
news:er******** ******@TK2MSFTN GP04.phx.gbl...
"BillE" <be****@datamti .comwrote in message
news:%2******** **********@TK2M SFTNGP03.phx.gb l...
>For example, if you are using Master pages, as far as I can tell, this
means that a customer ID must be passed by query string for GET requests,
and by hidden fields for POST requests when a new child page is being
called.
Is this an accurate statement?
Not im my experience - I use ViewState all the time within ContentPages...
"BillE" <be****@datamti .comwrote in message
news:ul******** ******@TK2MSFTN GP04.phx.gbl...
Do your content pages initially receive parameters from query strings or
hidden fields?
Neither - they most often receive them from a Session variable which is read
and destroyed on Page_Load, surrounded by if (!IsPostBack). If the user
tries to open the page directly either by typing the URL into the address
bar directly or clicking File, New, that Session variable won't be there, so
the process will not continue. Instead, the user will be redirected to an
error page telling them not to do what they tried to do...
Good solution. Thanks!
"Mark Rae" <ma**@markNOSPA Mrae.comwrote in message
news:e2******** *****@TK2MSFTNG P05.phx.gbl...
"BillE" <be****@datamti .comwrote in message
news:ul******** ******@TK2MSFTN GP04.phx.gbl...
>Do your content pages initially receive parameters from query strings or
hidden fields?
Neither - they most often receive them from a Session variable which is
read and destroyed on Page_Load, surrounded by if (!IsPostBack). If the
user tries to open the page directly either by typing the URL into the
address bar directly or clicking File, New, that Session variable won't be
there, so the process will not continue. Instead, the user will be
redirected to an error page telling them not to do what they tried to
do...
Your concern is valid, but this isn't really a problem with session
variables. It's more a question of where you should store different kind
of state.
Session variables are suitable for values that remain the same
throughout the session, like the id of the logged in user. The id of the
customer that you are currently viewing is something that should follow
the page rather than the session.
If you would store session specific data in an application variable,
that would of course be a problem if there ever is more than one session
active at the same time. In the same way, if you store page specific
data in a session variable, there is a problem if one user has more than
one page open at the same time.
BillE wrote:
Some ASP.NET applications use Session Variables extensively to maintain
state.
These should be re-written to use viewstate, hidden fields, querystring,
etc. instead.
This is because if a user opens a new IE window with Ctrl-N or
File-New-Window, BOTH WINDOWS SHARE THE SAME SESSION VARIABLES. This cannot
be prevented.
This means that if you change the value of a session variable in the second
window, it is also changed in the first window.
Session variables should only be used if this behavior is recognized and
compensated for.
I inherited a VB6 web class application which uses session variables
extensively. Users told me that sometimes orders were being added for the
wrong customer. I found that this occured when they opened a second browser
using Ctrl-N, changed the customer in the new window, and then returned to
the first window to add an order. They didn't realize that the customer
displayed in the first window was no longer consistent with the customer ID
stored in the shared CustomerID session variable.
Well put.
Unfortunately, I suspect there are many developers who use the convenience
of session variables to persist values (like Customer ID) without realizing
that a user will eventually compromise the application with a simple action
like Ctrl-N.
The only time I see this risk mentioned is in posts in newsgroups and forums
from distressed and perplexed developers!
Thanks
Bill
"Göran Andersson" <gu***@guffa.co mwrote in message
news:Of******** ********@TK2MSF TNGP03.phx.gbl. ..
Your concern is valid, but this isn't really a problem with session
variables. It's more a question of where you should store different kind
of state.
Session variables are suitable for values that remain the same throughout
the session, like the id of the logged in user. The id of the customer
that you are currently viewing is something that should follow the page
rather than the session.
If you would store session specific data in an application variable, that
would of course be a problem if there ever is more than one session active
at the same time. In the same way, if you store page specific data in a
session variable, there is a problem if one user has more than one page
open at the same time.
BillE wrote:
>Some ASP.NET applications use Session Variables extensively to maintain
state.
These should be re-written to use viewstate, hidden fields, querystring,
etc. instead.
This is because if a user opens a new IE window with Ctrl-N or
File-New-Window, BOTH WINDOWS SHARE THE SAME SESSION VARIABLES. This
cannot be prevented.
This means that if you change the value of a session variable in the
second window, it is also changed in the first window.
Session variables should only be used if this behavior is recognized and
compensated for.
I inherited a VB6 web class application which uses session variables
extensively. Users told me that sometimes orders were being added for
the wrong customer. I found that this occured when they opened a second
browser using Ctrl-N, changed the customer in the new window, and then
returned to the first window to add an order. They didn't realize that
the customer displayed in the first window was no longer consistent with
the customer ID stored in the shared CustomerID session variable.
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