public Ativo(string ticker, Uri pathGetHtml)
{
this.ticker = ticker;
this.proventos = new List <Provento>();
string htmlTexto = "";
SimpleFunctions.GetHtml(pathGetHtml.AbsoluteUri + ticker, ref htmlTexto);
_htmlDocument = new HtmlDocument();
_htmlDocument.LoadHtml(htmlTexto);
inicializarAtivo();
}