从webService将文件保存到文件夹

Question

下午好，我在Sql的表中有以下数据

Comprobante Categoria
    603552       A
    624997       A
    651880       A
    672298       C
    615985       C
    613804       C
    617970       A
    625688       A
    689463       B
    611686       B

然后生成一个控制台应用程序，通过获取凭证编号并下载.pdf来查询WebService，但它会阻止我，此应用程序必须通过从Vouchers表中获取sql查询的值来按类别生成文件夹，在每个文件夹中，下载与该类别对应的发票，以便在每个文件夹中按类别对发票进行排序。我感谢所有的帮助。

static void Main(string[] args)
        {
            string url = null;
string strSQL = "SELECT numeroComprobante,categoria FROM Comprobantes";

            SqlConnection con = new SqlConnection("********");
            SqlCommand cmd = new SqlCommand(strSQL, con);
            con.Open();
            SqlDataReader reader = cmd.ExecuteReader();

            while (reader.Read())
            {
                var request = new Services.consultarDocumento()
                {
                    request = new Services.requestConsultaDocumento()
                    {

                        numeroComprobante = reader["numeroComprobante"],
                    }

                };

            var address = new EndpointAddress(new Uri("*********"));

            BasicHttpBinding binding = new BasicHttpBinding();
            binding.Name = "basicHttpBinding";
            binding.HostNameComparisonMode = HostNameComparisonMode.StrongWildcard;
            binding.Security.Mode = BasicHttpSecurityMode.None;

            var client = new Services.ConsultaDocumentoClient(binding, address);

            var response = client.consultarDocumento(request);

            var Factura= @return.Documento;
            }

            reader.Close();
            con.Close();

    }
  }