System.Web.HttpCookieCollection.Get()

public HttpCookie Get(String name) {
    HttpCookie cookie = (HttpCookie)BaseGet(name); 

    if (cookie == null && _response != null) { 
        // response cookies are created on demand 
        cookie = new HttpCookie(name);
        AddCookie(cookie, true); 
        _response.OnCookieAdd(cookie);
    }

    return cookie; 
}