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check for cookies

I'm trying to do a check to see if the client browser has cookies
enabled. But my code below always gives me the value for acceptsCookies
= true, whether the machine has cookies enabled or not.

Can anybody help me out with this?
private void Page_Load(object sender, System.EventArgs e)
{
if (!(Page.IsPostBack))
{
//check browser accepts cookies
HttpCookie checkCookies = new HttpCookie("checkCookies");
checkCookies.Values["userName"] = "mike";
Response.Cookies.Add(checkCookies);

bool acceptsCookies = false;

if (Request.Cookies["checkCookies"].Values["userName"] == null)
{
acceptsCookies = false;
}
else
{
acceptsCookies = true;

//Delete test cookie
Response.Cookies["checkCookies"].Expires =
DateTime.Now.AddDays(-1);
}

lblInfo.Text = acceptsCookies ? "Accepts cookies" : "Doesn't accept
cookies";
}
}

Cheers,

Mike
*** Sent via Developersdex http://www.developersdex.com ***
Don't just participate in USENET...get rewarded for it!
Nov 18 '05 #1
4 1879
the only way to know if the broswe is accepting cookies, is to set a cookie,
send it to the browser, and have the browser post it back. on postback,
check to see if your cookie value is there, this is usually done with a
sniffer page for the site.

-- bruce (sqlwork.com)


"mike parr" <mp********@yahoo.co.uk> wrote in message
news:O6**************@TK2MSFTNGP09.phx.gbl...
I'm trying to do a check to see if the client browser has cookies
enabled. But my code below always gives me the value for acceptsCookies
= true, whether the machine has cookies enabled or not.

Can anybody help me out with this?
private void Page_Load(object sender, System.EventArgs e)
{
if (!(Page.IsPostBack))
{
//check browser accepts cookies
HttpCookie checkCookies = new HttpCookie("checkCookies");
checkCookies.Values["userName"] = "mike";
Response.Cookies.Add(checkCookies);

bool acceptsCookies = false;

if (Request.Cookies["checkCookies"].Values["userName"] == null)
{
acceptsCookies = false;
}
else
{
acceptsCookies = true;

//Delete test cookie
Response.Cookies["checkCookies"].Expires =
DateTime.Now.AddDays(-1);
}

lblInfo.Text = acceptsCookies ? "Accepts cookies" : "Doesn't accept
cookies";
}
}

Cheers,

Mike
*** Sent via Developersdex http://www.developersdex.com ***
Don't just participate in USENET...get rewarded for it!

Nov 18 '05 #2
I think you need to set the cookie on one page and check it on another page. Otherwise you may get inaccurate results, I don't think its a problem with your code. I remember I had the same issue with classic ASP ages ago and had to do the same thing to resolve it. So just split your code into two pages as shown below and it will work

[Page1.aspx

HttpCookie checkCookies = new HttpCookie("checkCookies")
checkCookies.Values["userName"] = "mike"
Response.Cookies.Add(checkCookies)
Response.Cookies["checkCookies"].Expires =DateTime.Now.AddDays(1)
Response.Redirect("Page2.aspx")

[Page2.apx]
bool acceptsCookies = false

//Notice how I have changed Request.Cookies["checkCookies"].Values["userName"] to Request.Cookies["checkCookies"] below
// Or you *may* get a System.NullReferenceException. I say *may* becuase i got it only in Mozilla 1.4 and not in IE6.0, weird
// With IE6.0 whether I blocked all cookies or not it was resolving to true, so I am not sure what is happening ther

if (Request.Cookies["checkCookies"] == null

acceptsCookies = false

els

acceptsCookies = true

//Delete test cooki
Response.Cookies["checkCookies"].Expires = DateTime.Now.AddDays(-1)
lblInfo.Text = acceptsCookies ? "Accepts cookies" : "Doesn't accept cookies"
References
http://msdn.microsoft.com/library/de...tcookies101.as

Rasik

Nov 18 '05 #3
Rasika,

I've tried what you suggested and it still returns true whether or not
cookies are enabled or disabled or my machine. I've also tried the code
in the Microsoft link, and I get the same result :

http://msdn.microsoft.com/library/de.../en-us/dv_vste
chart/html/vbtchaspnetcookies101.asp

Yet my old ASP code works fine at detecting whether cookies are enabled
or not. This is driving me crazy! Surely someone else has encountered
this problem before?
Mike

*** Sent via Developersdex http://www.developersdex.com ***
Don't just participate in USENET...get rewarded for it!
Nov 18 '05 #4
When you say "whether or not cookies are enabled or disabled or my
machine" are you talking about disabling them in the browser? In IE?
In the Internet or Intranet zone? Because the Privacy slider used to
disable cookies in IE is only for the internet, not Intranet, which is
probably where your dev machine is located.

To disable cookies in Intranet zone, put http://localhost or
http://<machine name> into the Security Restricted Zones list.

mike parr <mp********@yahoo.co.uk> wrote in message news:<Oy**************@TK2MSFTNGP09.phx.gbl>...
Rasika,

I've tried what you suggested and it still returns true whether or not
cookies are enabled or disabled or my machine. I've also tried the code
in the Microsoft link, and I get the same result :

http://msdn.microsoft.com/library/de.../en-us/dv_vste
chart/html/vbtchaspnetcookies101.asp

Yet my old ASP code works fine at detecting whether cookies are enabled
or not. This is driving me crazy! Surely someone else has encountered
this problem before?
Mike

*** Sent via Developersdex http://www.developersdex.com ***
Don't just participate in USENET...get rewarded for it!

Nov 18 '05 #5

This thread has been closed and replies have been disabled. Please start a new discussion.

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