/// <summary>
/// Adds the specified token and <see cref="ICaptchaValue" /> to the storage.
/// </summary>
/// <param name="captchaPair">
/// The specified <see cref="KeyValuePair{TKey,TValue}" />
/// </param>
public virtual void Add(KeyValuePair <string, ICaptchaValue> captchaPair)
{
Validate.ArgumentNotNull(captchaPair, "captchaPair");
Validate.ArgumentNotNull(captchaPair.Value, "captchaPair");
string drawingKey = CookieName + DrawingKey;
HttpCookie httpCookieDrawing = HttpContext.Current.Request.Cookies[drawingKey] ??
new HttpCookie(drawingKey);
HttpCookie httpCookie = HttpContext.Current.Request.Cookies[CookieName] ??
new HttpCookie(CookieName);
httpCookie.Expires = httpCookieDrawing.Expires = DateTime.Now.AddMinutes(ExpiresMinutes);
httpCookie.HttpOnly = httpCookieDrawing.HttpOnly = true;
string serialize = Serialize(captchaPair.Value);
ClearCookieIfNeed(httpCookie);
ClearCookieIfNeed(httpCookieDrawing);
httpCookie.Values.Add(captchaPair.Key, serialize);
httpCookieDrawing.Values.Add(captchaPair.Key, serialize);
HttpContext.Current.Response.Cookies.Add(httpCookie);
HttpContext.Current.Response.Cookies.Add(httpCookieDrawing);
}