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June 3, 2009 / kiranpatils

How to delete Cookie?


Today, i was implementing Remember Me Functionality in one of my application. I know you know what is “Remember Me” functionality. But when user says “Signout” i need to Forgot the user and to do that i need to delete my Cookie which i persisted when user says “Remember Me”..So, you will say simple delete cookie..But sorry sir you can’t delete cookie because it is on client side and user/browser can delete it..So, shall we ask user to delete cookie?? no we should not..then we just have one friend left “Browser”. But we need to cheat our friend[I strongly discourage cheating a real friend in real life :)]. We don’t have any method by which we can delete the cookie directly but we can delete it..Want to know how??


Okay, Boss relax!!! Here is the solution you should set the cookies Expiry date to past date..So, whenever Browser will see that it is expired it will discard that cookie.. I have created one method which you can directly use using Control Inheritance[COPY-PASTE] :).. in which you just need to pass Cookie’s name rest smart method will manage 🙂

Here it is:

public static void RemoveCookie(string key)
//get cookie
HttpCookie cookie = null;
if (HttpContext.Current.Request.Cookies[key] != null)
cookie = HttpContext.Current.Request.Cookies[key];
//You can't directly delte cookie you should
//set its expiry date to earlier date cookie.Expires = DateTime.Now.AddDays(-1);
//Add expired cookie back to response - send to browser

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