mvc 5 does not delete a cookie - cookies

Question

I am trying to delete all cookies from the responder,
the function is inside a service project.
code:
int limit = HttpContext.Current.Request.Cookies.Count;
for (int i = 0; i < limit; i++)
{
cookieName = HttpContext.Current.Request.Cookies[i].Name;
aCookie = new HttpCookie(cookieName);
aCookie.Value = null;
aCookie.Expires = DateTime.Now.AddYears(-1);
HttpContext.Current.Response.Cookies.Add(aCookie)
}
but the response only adds more cookies with the same name. How do I fix this?

Answer 1

Try this:
string[] myCookies = Request.Cookies.AllKeys;
foreach (string cookie in myCookies)
{
Response.Cookies[cookie].Expires = DateTime.Now.AddDays(-1);
}
Edit: this suggestion is based on the guestimate that it has to do with you adding the cookie to the response instead of updating the one that's already present.

Answer 2

after a lot of head banging I finaly noticed that while creating the cookie as followed it did the trick
cookie = new HttpCookie(CookieName, CustId);
declaring the cookie in any other manner didn't work,
for example :
int limit = HttpContext.Current.Request.Cookies.Count;
for (int i = 0; i < limit; i++)
{
cookieName = HttpContext.Current.Request.Cookies[i].Name;
aCookie = new HttpCookie(cookieName);
aCookie.Value = null;
aCookie.Expires = DateTime.Now.AddYears(-1);
HttpContext.Current.Response.Cookies.Add(aCookie);
}
or
var cookie = HttpContext.Current.Response.Cookies[CookieName];
if(cookie == null)
{
cookie = new HttpCookie(CookieName, CustId);
}
else
{
cookie.Expires = DateTime.Now.AddDays(-100);
HttpContext.Current.Response.Cookies.Add(cookie);
//HttpContext.Current.Session.Clear();
}