private void PopulateTreeView(XmlDocument doc, TreeView view)
        {
            XmlNode root = doc.SelectSingleNode("/*");

            TreeNode node = new TreeNode(root.Attributes[0].InnerText);
            view.Nodes.Add(node);
            XmlNodeList children = root.ChildNodes;

            AddChildren(children, node);

        }

        private void AddChildren(XmlNodeList children, TreeNode node)
        {
            foreach (XmlNode c_node in children)
            {
                TreeNode newnode = new TreeNode(c_node.Attributes[0].InnerText);
                node.Nodes.Add(newnode);
                if(c_node.HasChildNodes == true)
                {
                    AddChildren(c_node.ChildNodes, newnode);
                }
            }
        }