Question

I’m trying to delete some cookie which was set by javascript, it works well in Firefox and Chrome but not in IE, it deletes the cookie value in IE but not the file, so when I’m loading the page which uses cookie it loads some junk instead of nothing after delete.

I set the cookie like this

            var exdate = new Date();
            exdate.setDate(exdate.getDate() + 1);
            var c_value = escape(data.d) + "; expires=" + exdate.toUTCString();
            document.cookie = "user" + "=" + data.d;

and delete it like this

document.cookie = 'user=; expires=Thu, 01-Jan-70 00:00:01 GMT;';

where is my problem?

---

I also have the code in C# for ASP.Net to delete the cookie, but it doesn’t work in none of web browsers, (it works for cookie which was set by C# but not with Javascript) where is the problem with this code as well?

FormsAuthentication.SignOut();
    Response.Cookies["user"].Expires = DateTime.Now.AddDays(-1);
    Session.Clear();
    Response.Cookies.Clear();

Answer 1

you must send cookie to the response stream otherwise your modification will never be committed to the browser.

I usually use this code to logout:

FormsAuthentication.SignOut();
CurrentContext.Session.Abandon();
HttpCookie c = CurrentContext.Request.Cookies[FormsAuthentication.FormsCookieName];
if (c != null)
{
     c.Expires = DateTime.Now.AddDays(-1);
     CurrentContext.Response.Cookies.Add(c);
}