Something like this, with an inner loop:

        XmlNodeList xnList = xml.SelectNodes("/instruction");
        foreach (XmlElement xn in xnList)
        {
            text += "Instruction Name : " + xn.GetAttribute("name") + Environment.NewLine + Environment.NewLine;
            foreach (XmlElement cn in xn.SelectNodes("connection"))
            {
                text += "Connection : " + xn.InnerText + Environment.NewLine + Environment.NewLine;
            }
        }