public TaxaJuros GetFirstOrDefault()
 {
     using (var context = new TaxaJurosContext())
     {
         return(context.TaxaJuros.FirstOrDefault());
     }
 }
        public TaxaJurosRepository()
        {
            using (var context = new TaxaJurosContext())
            {
                TaxaJuros objTaxaJuros = context.TaxaJuros.FirstOrDefault(x => x.Id == 1);
                if (objTaxaJuros == null)
                {
                    context.TaxaJuros.Add(new TaxaJuros()
                    {
                        Id        = 1,
                        ValorTaxa = 0.01m
                    });

                    context.SaveChanges();
                }
            }
        }