public Corresponsal obtenerCorresponsalOficinaMaxLong(int corresponsalID)
        {
            try
            {
                string sql = "SELECT TOP 1 " +
                             "C.COR_CORRESPONSAL_ID, C.COR_NOMBRE, O.OFI_NOMBRE " +
                             "FROM Corresponsales AS C " +
                             "INNER JOIN OFICINAS AS O " +
                             "ON C.COR_CORRESPONSAL_ID = O.OFI_CORRESPONSAL_ID " +
                             "WHERE LEN(OFI_NOMBRE) = (SELECT MAX(LEN(OFI_NOMBRE)) FROM OFICINAS WHERE OFICINAS.OFI_CORRESPONSAL_ID = O.OFI_CORRESPONSAL_ID )" +
                             "AND C.COR_CORRESPONSAL_ID = " + corresponsalID.ToString();

                using (SqlConnection cnn = new SqlConnection(cnnString))
                {
                    cnn.Open();
                    SqlCommand cmd = new SqlCommand(sql, cnn);

                    SqlDataReader dr = cmd.ExecuteReader();

                    dr.Read();
                    ///////////////////////////////////////////////////////////
                    Corresponsal corr = new Corresponsal()
                    {
                        id        = Convert.ToInt32(dr["COR_CORRESPONSAL_ID"]),
                        nombre    = dr["COR_NOMBRE"].ToString(),
                        ofiNombre = dr["OFI_NOMBRE"].ToString()
                    };

                    return(corr);
                }
            } catch
            {
                return(null);
            }
        }
        public List <Corresponsal> obtenerCorresponsales()
        {
            string sql = "SELECT COR_CORRESPONSAL_ID, COR_NOMBRE, COUNT(O.OFI_CORRESPONSAL_ID) AS COR_NRO_OFI " +
                         "FROM CORRESPONSALES AS C " +
                         "INNER JOIN OFICINAS AS O " +
                         "ON O.OFI_CORRESPONSAL_ID = C.COR_CORRESPONSAL_ID " +
                         "GROUP BY COR_CORRESPONSAL_ID, COR_NOMBRE ORDER BY COR_NOMBRE;";


            using (SqlConnection cnn = new SqlConnection(cnnString))
            {
                cnn.Open();
                SqlCommand cmd = new SqlCommand(sql, cnn);

                SqlDataReader dr = cmd.ExecuteReader();

                List <Corresponsal> Lista = new List <Corresponsal>();

                while (dr.Read())
                {
                    Corresponsal corr = new Corresponsal()
                    {
                        id     = Convert.ToInt32(dr["COR_CORRESPONSAL_ID"]),
                        nombre = dr["COR_NOMBRE"].ToString(),
                        // ofiNombre = dr["OFI_NOMBRE"].ToString()

                        nroOfi = Convert.ToInt32(dr["COR_NRO_OFI"])
                    };


                    Lista.Add(corr);
                }

                return(Lista);
            }
        }