System.Xml.XmlAttributeCollection.SetNamedItem C# (CSharp) Method

        public override XmlNode SetNamedItem(XmlNode node) {
            if (node != null && !(node is XmlAttribute))
                throw new ArgumentException(Res.GetString(Res.Xdom_AttrCol_Object));

            int offset = FindNodeOffset( node.LocalName, node.NamespaceURI );
            if (offset == -1) {
                return InternalAppendAttribute( (XmlAttribute) node );
            }
            else {
                XmlNode oldNode = base.RemoveNodeAt( offset );
                InsertNodeAt( offset, node );
                return oldNode;
            }
        }