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C# - How to delete cookie from .Net - Stack Overflow
Published: 2015-04-23
David Edelstein
To remove a cookie, remove it from the response, then add a new cookie with a blank value that has already expired. I’m not sure why Response.Cookies.Remove doesn’t get this to work. But the following does:
HttpCookie currentUserCookie = HttpContext.Current.Request.Cookies["currentUser"];
HttpContext.Current.Response.Cookies.Remove("currentUser");
currentUserCookie.Expires = DateTime.Now.AddDays(-10);
currentUserCookie.Value = null;
HttpContext.Current.Response.SetCookie(currentUserCookie);