private void PopulateDropDownLists()
 {
     if (catb.GetQtdCategoria() > 0)
     {
         ViewBag.CategoriaId = new SelectList(catb.GetActivedCategorias(), "Id", "Nome");
     }
     if (cob.GetQtdCobrancas() > 0)
     {
         ViewBag.CobrancaId = new SelectList(cob.GetCobrancasList(), "Id", "Nome");
     }
 }