Session_End?

[Bonj]

Hi
I have an ASP.NET application which implements a server-side charting
solution, for this it needs to generate .gif files which are then sent to
the browser via a literal which has its text set to "<img src=\" +
graphfilename + \"/>. This is all working beautifully, however all these
..gif files are going to build up on the server and are going to need
deleting. I tried putting some code in the Session_End function in
global.asax, but Session_End *NEVER* fires. (I proved this to be the case
because I put some code to write to a log file on Session_Start,
Session_End, Application_Sta rt and Application_End . After a couple of days,
the *_End ones never logged once, but there were about 5 Application_Sta rts
(which I presume represent the first time it started after a rebuild?) and a
load of Session_Starts) . This is the case no matter whether a debug build or
release build is done.

Short of creating a bot that will be scheduled to run every 24 hours to
delete all old files, how can I delete all the files as soon as possible,
but after they are needed?

I tried putting Response.Flush( ) and then deleting the file after that, but
the browser doesn't then get the image. I'm tempted to try creating a new
thread that waits for a few seconds, deletes the file, then dies. But this
sounds messy as I don't know how good an idea it is to create an extra
thread from a code-behind in an IIS application, what with IIS obviously
being extremely multithreaded itself intrinsically.
Given that Session_End never fires, what would be the best way to delete
files as and when they are used, but making sure that the browser has had
chance to pick them up?
Or would the bot be a better solution ? I'd certainly be happy with that,
although if there is cleaner solution I'd like to know what it is in order
to implement that instead.#

[Roger Twomey]

I have used Session_End before and it worked. This is curious.

Can you post a sample of how you were doing your testing?

Is it possible the code caused an error which would not be logged, then
abandoned the session?
"Bonj" <[e-mail]> wrote in message
news:e6******** *****@TK2MSFTNG P11.phx.gbl...

Hi
I have an ASP.NET application which implements a server-side charting
solution, for this it needs to generate .gif files which are then sent to
the browser via a literal which has its text set to "<img src=\" +
graphfilename + \"/>. This is all working beautifully, however all these
.gif files are going to build up on the server and are going to need
deleting. I tried putting some code in the Session_End function in
global.asax, but Session_End *NEVER* fires. (I proved this to be the case
because I put some code to write to a log file on Session_Start,
Session_End, Application_Sta rt and Application_End . After a couple of days, the *_End ones never logged once, but there were about 5 Application_Sta rts (which I presume represent the first time it started after a rebuild?) and a load of Session_Starts) . This is the case no matter whether a debug build or release build is done.

Short of creating a bot that will be scheduled to run every 24 hours to
delete all old files, how can I delete all the files as soon as possible,
but after they are needed?

I tried putting Response.Flush( ) and then deleting the file after that, but the browser doesn't then get the image. I'm tempted to try creating a new
thread that waits for a few seconds, deletes the file, then dies. But this
sounds messy as I don't know how good an idea it is to create an extra
thread from a code-behind in an IIS application, what with IIS obviously
being extremely multithreaded itself intrinsically.
Given that Session_End never fires, what would be the best way to delete
files as and when they are used, but making sure that the browser has had
chance to pick them up?
Or would the bot be a better solution ? I'd certainly be happy with that,
although if there is cleaner solution I'd like to know what it is in order
to implement that instead.#

[Bonj]

Can you post a sample of how you were doing your testing

//This is in global.asax
protected void Session_End(Obj ect sender, EventArgs e

LogToText("Sess ion ended")
protected void LogToText(strin g message

System.IO.Strea mWriter sw = new StreamWriter(Se rver.MapPath(@" tempcharts\logf ile.txt"), true)
message += " " + DateTime.Now.To String()
if((User != null) && (User.Identity != null)) message += " (user = " + User.Identity.N ame + ")"
sw.WriteLine(me ssage)
sw.Close()
Is it possible the code caused an error which would not be logged, the
abandoned the session

No, it wasn't erroring. I put exactly the same function call in Session_Start and Application_Sta rt only passing a different string, and that worked fine

I think I'll go for a daily bot. Never mind

"Bonj" <[e-mail]> wrote in messag
news:e6******** *****@TK2MSFTNG P11.phx.gbl..

H
I have an ASP.NET application which implements a server-side chartin
solution, for this it needs to generate .gif files which are then sent t
the browser via a literal which has its text set to "<img src=\"
graphfilename + \"/>. This is all working beautifully, however all thes
.gif files are going to build up on the server and are going to nee
deleting. I tried putting some code in the Session_End function i
global.asax, but Session_End *NEVER* fires. (I proved this to be the cas
because I put some code to write to a log file on Session_Start
Session_End, Application_Sta rt and Application_End . After a couple o days the *_End ones never logged once, but there were about Application_Sta rt (which I presume represent the first time it started after a rebuild?) an load of Session_Starts) . This is the case no matter whether a debug buil o release build is done

Short of creating a bot that will be scheduled to run every 24 hours t delete all old files, how can I delete all the files as soon as possible
but after they are needed

I tried putting Response.Flush( ) and then deleting the file after that bu the browser doesn't then get the image. I'm tempted to try creating a ne
thread that waits for a few seconds, deletes the file, then dies. But thi
sounds messy as I don't know how good an idea it is to create an extr
thread from a code-behind in an IIS application, what with IIS obviousl
being extremely multithreaded itself intrinsically
Given that Session_End never fires, what would be the best way to delet
files as and when they are used, but making sure that the browser has ha
chance to pick them up
Or would the bot be a better solution ? I'd certainly be happy with that
although if there is cleaner solution I'd like to know what it is in orde
to implement that instead.