试试这个删除你的cookies：

public void DeleteCookie(string name)
{
    DateTime now = DateTime.UtcNow;
    string cookieKey = name;
    var cookie = new HttpCookie(cookieKey,null)
    {
        Expires = now.AddDays(-1)
    };
    HttpContext.Response.Cookies.Set(cookie);
}

用法：

DeleteCookie("__ControllerTempData");