Get parent and child from another treeview

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C#

ASP.NET

treeview

I have a function where I get the parent and the childnode and i want each time the user clicked on the sitemap wich is composed by the following code:

Label_fatdata.Text += "<a id="fatdata" style="removed:pointer; margin-removed0px; text-transform:uppercase; font-size:10px; font-weight:500;" önclick="\"click(TreeView1," snode="" mode="hold" />

i want that redraws the main tree with the node (parent + child) that he gets from the backup tree. But so far I am having a lot of problems...first in if clause i need to verify the element 'a' with the backup tree.

void click(TreeView one, TreeView two)
        {
            if (one.SelectedNode.ValuePath == two.SelectedNode.ValuePath)
            {
                TreeNode parentdata = two.SelectedNode.Parent;
                TreeNodeCollection childdata = two.SelectedNode.ChildNodes;

                one.Nodes.Add(parentdata);
                one.Nodes[0].ChildNodes.Add(childdata[0]);
                one.Nodes.Clear();
                one.DataBind();
            }
        }