I am working on an asp.net 1.1 web app in C#. I downloaded some sample
code that is supposed to allow for me to persist session state. The
code is as follows:
private void PersistSessionS tate()
{
int MilliSecondsTim eOut = (this.Session.T imeout * 60000) - 30000;
string Script = @"
<script type='text/javascript'>
var Count=0;
var Max = 1000;
function PersistSessionS tate()
{
Count++;
if (Count<Max)
{
window.status = 'Link to server refreshed ' +
Count.toString( )+' time(s)';
var Img = new Image(1,1);
Img.src = '/PersistSessionS tate.aspx';
}
}
window.setInter val('PersistSes sionState()'," +
MilliSecondsTim eOut.ToString() + @");
</script>
";
this.Page.Regis terClientScript Block("PersistS essionState", Script);
}
When I put this into my app, I did the following:
1. I added this function to the code behind page.
2. I added the line "this.PersistSe ssionState();" to call the function
from the Page_Load event handler.
3. I added "<%@ OutputCache Location='None' VaryByParam='No ne' %>" at
the top of the aspx page, to control the client-side caching.
4. I set the session timeout value to "1" in the web.config file.
Now, when I run this, (predictably) after about thirty seconds, the
status bar reads "Link to server refreshed 1 time(s)". As you can see
in the javascript code, this fires about thirty seconds before the
Session times out. So, when I see the message and wait about 45
seconds or so after, if I try to click another page on the site, I get
a "Server Error in '/' Application - Object reference no set to an
instance of an object" message. This happens because the solution did
not work - the session expired.
So what is wrong with this solution? Why doesn't it work? How can I
fix it?
Thanks in advance for your help.
JP 3 2738
could be caching, try:
Img.src = '/PersistSessionS tate.aspx?c=' + Count;
bruce (sqlwork.com)
Joey wrote:
I am working on an asp.net 1.1 web app in C#. I downloaded some sample
code that is supposed to allow for me to persist session state. The
code is as follows:
private void PersistSessionS tate()
{
int MilliSecondsTim eOut = (this.Session.T imeout * 60000) - 30000;
string Script = @"
<script type='text/javascript'>
var Count=0;
var Max = 1000;
function PersistSessionS tate()
{
Count++;
if (Count<Max)
{
window.status = 'Link to server refreshed ' +
Count.toString( )+' time(s)';
var Img = new Image(1,1);
Img.src = '/PersistSessionS tate.aspx';
}
}
window.setInter val('PersistSes sionState()'," +
MilliSecondsTim eOut.ToString() + @");
</script>
";
this.Page.Regis terClientScript Block("PersistS essionState", Script);
}
When I put this into my app, I did the following:
1. I added this function to the code behind page.
2. I added the line "this.PersistSe ssionState();" to call the function
from the Page_Load event handler.
3. I added "<%@ OutputCache Location='None' VaryByParam='No ne' %>" at
the top of the aspx page, to control the client-side caching.
4. I set the session timeout value to "1" in the web.config file.
Now, when I run this, (predictably) after about thirty seconds, the
status bar reads "Link to server refreshed 1 time(s)". As you can see
in the javascript code, this fires about thirty seconds before the
Session times out. So, when I see the message and wait about 45
seconds or so after, if I try to click another page on the site, I get
a "Server Error in '/' Application - Object reference no set to an
instance of an object" message. This happens because the solution did
not work - the session expired.
So what is wrong with this solution? Why doesn't it work? How can I
fix it?
Thanks in advance for your help.
JP
It appears MilliSecondsTim eOut is the object not set to instance - there
doesn't seem to be any declaration for the object (in the script block), and
you are attempting to access a "ToString() " method at the end of the script.
"Joey" wrote:
I am working on an asp.net 1.1 web app in C#. I downloaded some sample
code that is supposed to allow for me to persist session state. The
code is as follows:
private void PersistSessionS tate()
{
int MilliSecondsTim eOut = (this.Session.T imeout * 60000) - 30000;
string Script = @"
<script type='text/javascript'>
var Count=0;
var Max = 1000;
function PersistSessionS tate()
{
Count++;
if (Count<Max)
{
window.status = 'Link to server refreshed ' +
Count.toString( )+' time(s)';
var Img = new Image(1,1);
Img.src = '/PersistSessionS tate.aspx';
}
}
window.setInter val('PersistSes sionState()'," +
MilliSecondsTim eOut.ToString() + @");
</script>
";
this.Page.Regis terClientScript Block("PersistS essionState", Script);
}
When I put this into my app, I did the following:
1. I added this function to the code behind page.
2. I added the line "this.PersistSe ssionState();" to call the function
from the Page_Load event handler.
3. I added "<%@ OutputCache Location='None' VaryByParam='No ne' %>" at
the top of the aspx page, to control the client-side caching.
4. I set the session timeout value to "1" in the web.config file.
Now, when I run this, (predictably) after about thirty seconds, the
status bar reads "Link to server refreshed 1 time(s)". As you can see
in the javascript code, this fires about thirty seconds before the
Session times out. So, when I see the message and wait about 45
seconds or so after, if I try to click another page on the site, I get
a "Server Error in '/' Application - Object reference no set to an
instance of an object" message. This happens because the solution did
not work - the session expired.
So what is wrong with this solution? Why doesn't it work? How can I
fix it?
Thanks in advance for your help.
JP
On Apr 18, 9:35 pm, bruce barker <nos...@nospam. comwrote:
could be caching, try:
Img.src = '/PersistSessionS tate.aspx?c=' + Count;
bruce (sqlwork.com)
Joey wrote:
I am working on an asp.net 1.1 web app in C#. I downloaded some sample
code that is supposed to allow for me to persist session state. The
code is as follows:
private void PersistSessionS tate()
{
int MilliSecondsTim eOut = (this.Session.T imeout * 60000) - 30000;
string Script = @"
<script type='text/javascript'>
var Count=0;
var Max = 1000;
function PersistSessionS tate()
{
Count++;
if (Count<Max)
{
window.status = 'Link to server refreshed ' +
Count.toString( )+' time(s)';
var Img = new Image(1,1);
Img.src = '/PersistSessionS tate.aspx';
}
}
window.setInter val('PersistSes sionState()'," +
MilliSecondsTim eOut.ToString() + @");
</script>
";
this.Page.Regis terClientScript Block("PersistS essionState", Script);
}
When I put this into my app, I did the following:
1. I added this function to the code behind page.
2. I added the line "this.PersistSe ssionState();" to call the function
from the Page_Load event handler.
3. I added "<%@ OutputCache Location='None' VaryByParam='No ne' %>" at
the top of the aspx page, to control the client-side caching.
4. I set the session timeout value to "1" in the web.config file.
Now, when I run this, (predictably) after about thirty seconds, the
status bar reads "Link to server refreshed 1 time(s)". As you can see
in the javascript code, this fires about thirty seconds before the
Session times out. So, when I see the message and wait about 45
seconds or so after, if I try to click another page on the site, I get
a "Server Error in '/' Application - Object reference no set to an
instance of an object" message. This happens because the solution did
not work - the session expired.
So what is wrong with this solution? Why doesn't it work? How can I
fix it?
Thanks in advance for your help.
JP- Hide quoted text -
- Show quoted text -
OR
Img.src = '/PersistSessionS tate.aspx?' + new Date().getTime( )
also read this article about preload via js http://www.webreference.com/programm...pt/gr/column3/
or use XMLHTTP
var page_request = false;
page_request = new ActiveXObject(' Msxml2.XMLHTTP' );
page_request.op en('GET', '/PersistSessionS tate.aspx?' + new
Date().getTime( ), true);
page_request.se nd(null); This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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