Session Start / Application_Beg inRequest Issues

[Paul Daly (MCP)]

I'm trying to write a log file that captures the referring url if the request is a new session, and captures a querystring value if the user is browsing between pages on the website.

When using the code below, I get the following error...

"System.NullRef erenceException : Object reference not set to an instance of an object"

*************** *************** ************
protected void Session_Start(O bject sender, EventArgs e)
{
System.Uri refURL = Context.Request .UrlReferrer;
if(refURL != null)
{
Context.Session .Add("referingU RL", refURL.ToString ());
}
}
protected void Application_Beg inRequest(Objec t sender, EventArgs e)
{
string refPage = Context.Request .QueryString.Ge t("Page");
if(refPage != null)
{
Context.Session .Add("referingP age", refPage.ToStrin g());
}
}
*************** *************** ************

Does anyone know what I'm doing wrong?

Thanks in advance for your help!

[Craig Deelsnyder]

On Sun, 4 Jul 2004 10:08:01 -0700, Paul Daly <Paul Daly
(MCP)@discussio ns.microsoft.co m> wrote:

I'm trying to write a log file that captures the referring url if the
request is a new session, and captures a querystring value if the user
is browsing between pages on the website.

When using the code below, I get the following error...

"System.NullRef erenceException : Object reference not set to an instance
of an object"

*************** *************** ************
protected void Session_Start(O bject sender, EventArgs e)
{
System.Uri refURL = Context.Request .UrlReferrer;
if(refURL != null)
{
Context.Session .Add("referingU RL", refURL.ToString ());
}
}
protected void Application_Beg inRequest(Objec t sender, EventArgs e)
{
string refPage = Context.Request .QueryString.Ge t("Page");
if(refPage != null)
{
Context.Session .Add("referingP age", refPage.ToStrin g());
}
}
*************** *************** ************

Does anyone know what I'm doing wrong?

Thanks in advance for your help!

Which one is erroring out? Application_Beg inRequest is the first 'event'
in the chain, it's so early that Session is not available in it, so that
will get you in trouble there.

Also, I believe in Session_Start the Context still doesn't have a
reference to the Session, so unfortunately you're out of luck there as
well.

Others have said you can access it in Application_Pre RequestHandlerE xecute
and Application_Acq uireRequestStat e

--
Craig Deelsnyder
Microsoft MVP - ASP/ASP.NET

[Paul Daly (MCP)]

It errors out on Application_Beg inRequest.

Are you suggesting that I move the code from Session_Start to Application_Acq uireRequestStat e and from Application_Beg inRequest to Application_Pre RequestHandlerE xecute?

Also.. where can I find a complete listing of all of the events that occur during the lifecycle of a web application including Application_Pre RequestHandlerE xecute
and Application_Acq uireRequestStat e?

Thank you for your help.

"Craig Deelsnyder" wrote:

On Sun, 4 Jul 2004 10:08:01 -0700, Paul Daly <Paul Daly
(MCP)@discussio ns.microsoft.co m> wrote:

I'm trying to write a log file that captures the referring url if the
request is a new session, and captures a querystring value if the user
is browsing between pages on the website.

When using the code below, I get the following error...

"System.NullRef erenceException : Object reference not set to an instance
of an object"

*************** *************** ************
protected void Session_Start(O bject sender, EventArgs e)
{
System.Uri refURL = Context.Request .UrlReferrer;
if(refURL != null)
{
Context.Session .Add("referingU RL", refURL.ToString ());
}
}
protected void Application_Beg inRequest(Objec t sender, EventArgs e)
{
string refPage = Context.Request .QueryString.Ge t("Page");
if(refPage != null)
{
Context.Session .Add("referingP age", refPage.ToStrin g());
}
}
*************** *************** ************

Does anyone know what I'm doing wrong?

Thanks in advance for your help!

Which one is erroring out? Application_Beg inRequest is the first 'event'
in the chain, it's so early that Session is not available in it, so that
will get you in trouble there.

Also, I believe in Session_Start the Context still doesn't have a
reference to the Session, so unfortunately you're out of luck there as
well.

Others have said you can access it in Application_Pre RequestHandlerE xecute
and Application_Acq uireRequestStat e

--
Craig Deelsnyder
Microsoft MVP - ASP/ASP.NET

[Craig Deelsnyder]

On Sun, 4 Jul 2004 10:58:01 -0700, Paul Daly
<Pa*********@di scussions.micro soft.com> wrote:

It errors out on Application_Beg inRequest.

Are you suggesting that I move the code from Session_Start to
Application_Acq uireRequestStat e and from Application_Beg inRequest to
Application_Pre RequestHandlerE xecute?

Also.. where can I find a complete listing of all of the events that
occur during the lifecycle of a web application including
Application_Pre RequestHandlerE xecute
and Application_Acq uireRequestStat e?

Thank you for your help.

Some more info:

http://support.microsoft.com/default...n-us;Q312607#2

Actually, I think my statement before was incorrect; been awhile since I
looked at this myself, but in Session you should be able to see the
Session object, makes sense, see the example here:

http://samples.gotdotnet.com/quickst...eoverview.aspx

Sorry for the confusion...

--
Craig Deelsnyder
Microsoft MVP - ASP/ASP.NET