System.Net.Http.Headers.CookieHeaderValue.this C# (CSharp) Method

        public CookieState this[string name]
        {
            get
            {
                if (String.IsNullOrEmpty(name))
                {
                    return null;
                }

                CookieState cookie = Cookies.FirstOrDefault(c => String.Equals(c.Name, name, StringComparison.OrdinalIgnoreCase));
                if (cookie == null)
                {
                    cookie = new CookieState(name, String.Empty);
                    Cookies.Add(cookie);
                }
                return cookie;
            }
        }