How to delete cookies on an ASP NET website

Question

In my website when the user clicks on the  Logout  button  the Logout aspx page loads with code Session Clear     In ASP NET C   does this clear all cookies  Or is there any other code that needs to be added to remove all of the cookies of my website

User · Accepted Answer

Try something like that   if  Request Cookies  userId      null        Response Cookies  userId   Expires   DateTime Now AddDays -1          But it also makes sense to use   Session Abandon      besides in many scenarios

User · Answer

I just want to point out that the Session ID cookie is not removed when using Session Abandon as others said      When you abandon a session  the session ID cookie is not removed from   the browser of the user  Therefore  as soon as the session has been   abandoned  any new requests to the same application will use the same   session ID but will have a new session state instance  At the same   time  if the user opens another application within the same DNS   domain  the user will not lose their session state after the Abandon   method is called from one application        Sometimes  you may not want to reuse the session ID  If you do and if   you understand the ramifications of not reusing the session ID  use   the following code example to abandon a session and to clear the   session ID cookie   Session Abandon    Response Cookies Add new HttpCookie  ASP NET SessionId               This code example clears the session state from the server and sets   the session state cookie to null  The null value effectively clears   the cookie from the browser    http   support microsoft com kb 899918

User · Answer

It is 2018 now  so in ASP NET Core  there is a straight forward built in function  To delete a cookie try this code   if Request Cookies  aa      null        Response Cookies Delete  aa      return View

User · Answer

You should never store password as a cookie  To delete a cookie  you really just need to modify and expire it  You can t really delete it  ie  remove it from the user s disk    Here is a sample   HttpCookie aCookie      string cookieName      int limit   Request Cookies Count      for  int i 0  i lt limit  i                  cookieName   Request Cookies i  Name          aCookie   new HttpCookie cookieName           aCookie Expires   DateTime Now AddDays -1      make it expire yesterday         Response Cookies Add aCookie      overwrite it

User · Answer

Taking the OP s Question title as deleting all cookies -  Delete Cookies in website   I came across code from Dave Domagala on the web somewhere  I edited Dave s to allow for Google Analytics cookies too - which looped through all cookies found on the website and deleted them all   From a developer angle - updating new code into an existing site  is a nice touch to avoid problems with users revisiting the site    I use the below code in tandem with reading the cookies first  holding any required data - then resetting the cookies after washing everything clean with the below loop   The code   int limit   Request Cookies Count    Get the number of cookies and                                       use that as the limit  HttpCookie aCookie      Instantiate a cookie placeholder string cookieName        Loop through the cookies for int i   0  i  lt  limit  i       cookieName   Request Cookies i  Name       get the name of the current cookie  aCookie   new HttpCookie cookieName        create a new cookie with the same                                              name as the one you re deleting  aCookie Value            set a blank value to the cookie   aCookie Expires   DateTime Now AddDays -1        Setting the expiration date                                                   in the past deletes the cookie   Response Cookies Add aCookie        Set the cookie to delete it      Addition   If You Use Google Analytics  The above loop delete will delete ALL cookies for the site  so if you use Google Analytics - it would probably be useful to hold onto the   utmz cookie as this one keeps track of where the visitor came from  what search engine was used  what link was clicked on  what keyword was used  and where they were in the world when  your website was accessed   So to keep it  wrap a simple if statement once the cookie name is known        aCookie   new HttpCookie cookieName       if  aCookie Name       utmz         aCookie Value            set a blank value to the cookie      aCookie Expires   DateTime Now AddDays -1           HttpContext Current Response Cookies Add aCookie

User · Answer

You have to set the expiration date to delete cookies Request Cookies yourCookie   Expires Equals DateTime Now AddYears -1     This won t throw an exception if the cookie doesn t exist

User · Answer

No  Cookies can be cleaned only by setting the Expiry date for each of them   if  Request Cookies  UserSettings      null        HttpCookie myCookie   new HttpCookie  UserSettings        myCookie Expires   DateTime Now AddDays -1d       Response Cookies Add myCookie       At the moment of Session Clear      All the key-value pairs from Session collection are removed  Session End event is not happen    If you use this method during logout  you should also use the Session Abandon method to  Session End event    Cookie with Session ID  if your application uses cookies for session id store  which is by default  is deleted

User · Answer

Though this is an old thread  i thought if someone is still searching for solution in the future    HttpCookie mycookie   new HttpCookie  aa    mycookie Expires   DateTime Now AddDays -1d   Response Cookies Add mycookie1     Thats what did the trick for me

User · Answer

Unfortunately  for me  setting  Expires  did not always work   The cookie was unaffected   This code did work for me   HttpContext Current Session Abandon    HttpContext Current Response Cookies Add new HttpCookie  ASP NET SessionId           where  ASP NET SessionId  is the name of the cookie   This does not really delete the cookie  but overrides it with a blank cookie  which was close enough for me

User · Answer

This is what I use       private void ExpireAllCookies                 if  HttpContext Current    null                        int cookieCount   HttpContext Current Request Cookies Count              for  var i   0  i  lt  cookieCount  i                                  var cookie   HttpContext Current Request Cookies i                   if  cookie    null                                        var expiredCookie   new HttpCookie cookie Name                            Expires   DateTime Now AddDays -1                           Domain   cookie Domain                                            HttpContext Current Response Cookies Add expiredCookie      overwrite it                                                 clear cookies server side             HttpContext Current Request Cookies Clear

User · Answer

Response Cookies  UserSettings   Expires   DateTime Now AddDays -1

[c#] How to delete cookies on an ASP.NET website

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