Channel 9 Forums - Tech Off - Cookie Question http://mschnlnine.vo.llnwd.net/d1/Dev/App_Themes/C9/images/feedimage.png Channel 9 Forums - Tech Off - Cookie Question http://channel9.msdn.com/Forums Channel 9 keeps you up to date with the latest news and behind the scenes info from Microsoft that developers love to keep up with. From LINQ to SilverLight – Watch videos and hear about all the cool technologies coming and the people behind them. http://channel9.msdn.com/Forums en Wed, 22 May 2013 21:06:40 GMT Wed, 22 May 2013 21:06:40 GMT Rev9 9 -9 -1 Tech Off - Cookie Question In some button click event:
foreach (HttpCookie cookie in Request.Cookies)

{

cookie.Expires = DateTime.Now;

}

Say I am in PST as a client and the server is EST. Would my cookies expire now (percievable on next request) or in 3 hours?

]]> http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/259245#259245 Mon, 26 Nov 2007 21:44:50 GMT http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/259245#259245 odujosh 9 http://channel9.msdn.com/Niners/odujosh/Discussions/RSS Tech Off - Cookie Question Pick a date that's years before Now().

]]> http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/b5df7343acb84c27a7ae9dfa00905b76#b5df7343acb84c27a7ae9dfa00905b76 Mon, 26 Nov 2007 21:55:40 GMT http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/b5df7343acb84c27a7ae9dfa00905b76#b5df7343acb84c27a7ae9dfa00905b76 ZippyV 9 http://channel9.msdn.com/Niners/ZippyV/Discussions/RSS Tech Off - Cookie Question The time in the cookie would be in GMT, so you also wouldn't have the issue with time zones or winter time, but if you really want to expire it (time on server and time on client can be slightly off) expire it with:

cookie.Expires = DateTime.Now.AddYears(-1);

]]> http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/b8b9f5a9d1d6487eb0d19dfa00905bcc#b8b9f5a9d1d6487eb0d19dfa00905bcc Mon, 26 Nov 2007 22:23:26 GMT http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/b8b9f5a9d1d6487eb0d19dfa00905bcc#b8b9f5a9d1d6487eb0d19dfa00905bcc PeterF 9 http://channel9.msdn.com/Niners/PeterF/Discussions/RSS Tech Off - Cookie Question
PeterF wrote:
The time in the cookie would be in GMT, so you also wouldn't have the issue with time zones or winter time, but if you really want to expire it (time on server and time on client can be slightly off) expire it with:

cookie.Expires = DateTime.Now.AddYears(-1);


How would you figure out time zone of DateTime. How to adjust for GMT? I am curious about a more precise answer if anyone has one.

]]> http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/4345a22c26c14f98903b9dfa00905c21#4345a22c26c14f98903b9dfa00905c21 Mon, 26 Nov 2007 22:34:25 GMT http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/4345a22c26c14f98903b9dfa00905c21#4345a22c26c14f98903b9dfa00905c21 odujosh 9 http://channel9.msdn.com/Niners/odujosh/Discussions/RSS Tech Off - Cookie Question
The help text indicates that what you have should do it.Wink

http://msdn2.microsoft.com/en-us/library/system.web.httpcookie.expires.aspx

]]> http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/b1f415a606ea4df887e09dfa00905c73#b1f415a606ea4df887e09dfa00905c73 Mon, 26 Nov 2007 23:12:37 GMT http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/b1f415a606ea4df887e09dfa00905c73#b1f415a606ea4df887e09dfa00905c73 longnight 9 http://channel9.msdn.com/Niners/longnight/Discussions/RSS Tech Off - Cookie Question Yeah it seems to be a situation of do what I say not as I do (from documentation):

Property Value

The time of day (on the client) at which the cookie expires.


Then they turn around show:

DateTime dt = DateTime.Now;
TimeSpan ts = new TimeSpan(0,0,10,0);

MyCookie.Expires = dt.Add(ts);


DateTime.Now being the time on the server. So the right hand isn't talking to the left hand:)

Without building a TimeZone property into the user profile or defaulting to some timezone how do you figure out the clients timezone. Is there some javascript trick I should be aware of Tongue Out

So which is right? The text or the code?

]]> http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/c468c476a09e441191d79dfa00905cc6#c468c476a09e441191d79dfa00905cc6 Tue, 27 Nov 2007 01:17:04 GMT http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/c468c476a09e441191d79dfa00905cc6#c468c476a09e441191d79dfa00905cc6 odujosh 9 http://channel9.msdn.com/Niners/odujosh/Discussions/RSS Tech Off - Cookie Question The header is actually sent as a text representation of the date and for the cookie to be valid, it must be in the form:

DAY, DD-MMM-YYYY HH:MM:SS GMT

Since the function you are using takes care of the conversion from a DateTime object to this text, I would hope it would to the conversion for you.

I will be testing it as soon as I get VWD Express 2008 installed. Smiley

]]> http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/46f870149b9c441badbc9dfa00905d3a#46f870149b9c441badbc9dfa00905d3a Tue, 27 Nov 2007 01:46:14 GMT http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/46f870149b9c441badbc9dfa00905d3a#46f870149b9c441badbc9dfa00905d3a Jorgie 9 http://channel9.msdn.com/Niners/Jorgie/Discussions/RSS Tech Off - Cookie Question
odujosh wrote:

How would you figure out time zone of DateTime. How to adjust for GMT? I am curious about a more precise answer if anyone has one.


That's the thing, by expressing the DateTime object in GMT time, you completely avoid things like time zone and summer and winter time.

GMT time is completely neutral in that sense, and the DateTime format used by the cookie object takes advantage of that.

The only thing is, because the cookie object lifetime is not expressed in Time To Live (TTL), you always have a descrepancy between server time and client time. You can try to compensate it by synchronizing things, but you always have the issue of how long a transaction will take or the execution time or the transport time.

In that sense try to avoid expressing this explicitely yourself in the form of cookies, but use the session timeout mechanisms in stead provided by .NET and/or IIS

Good luck,
Peter

]]> http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/345a578cd2d346ed8f759dfa00905deb#345a578cd2d346ed8f759dfa00905deb Tue, 27 Nov 2007 12:52:13 GMT http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/345a578cd2d346ed8f759dfa00905deb#345a578cd2d346ed8f759dfa00905deb PeterF 9 http://channel9.msdn.com/Niners/PeterF/Discussions/RSS Tech Off - Cookie Question odujosh,

I just ran a test that shows that the conversion is made from server time zone to client time zone. However, if the client time is off by a few minutes, then the cookie can hang around for a few, or die a few minutes too soon. The source code for the test is in the Sandbox.

For absolute accuracy, you would need nab the client time and time zone, then convert the client time to the server time zone.

gl...

let me know if you nab the client time and time zone.

btw, you could just store the server time in a cookie and check for expiration yourself.

]]> http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/a26b283d0b98475d933e9dfa00905d90#a26b283d0b98475d933e9dfa00905d90 Thu, 29 Nov 2007 03:02:35 GMT http://channel9.msdn.com/Forums/TechOff/259245-Cookie-Question/a26b283d0b98475d933e9dfa00905d90#a26b283d0b98475d933e9dfa00905d90 longnight 9 http://channel9.msdn.com/Niners/longnight/Discussions/RSS