private void mostrarLista()
        {
            StringBuilder errorMessages = new StringBuilder();
            Editorial edi = new Editorial();
            try
            {

                if ((edi.OptenerPais(edi)).v_pais.Count != 0)
                {
                    SLpais = new SortedList();
                    foreach (String pais in edi.v_pais)
                    {
                        SLpais.Add(pais, pais);
                    }
                    com_pais.DataSource = SLpais.GetValueList();
                    com_pais.Show();
                }

            }
            catch (SqlException ex)
            {
                for (int i = 0; i < ex.Errors.Count; i++)
                {
                    errorMessages.Append("Index #" + i + "\n" +
                    "Message: " + ex.Errors[i].Message + "\n" +
                    "LineNumber: " + ex.Errors[i].LineNumber + "\n" +
                    "Source: " + ex.Errors[i].Source + "\n" +
                    "Procedure: " + ex.Errors[i].Procedure + "\n");
                }
                Console.WriteLine(errorMessages.ToString());

                MessageBox.Show(ex.Errors[0].Message.ToString(),
                "Agregar Editorial",
                MessageBoxButtons.OK,
                MessageBoxIcon.Warning);
            }
        }