treeview and listview windows

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C#

private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            listView1.Items.Clear();
                            

                // write this code inside your treeview NodeMouseCLick event
                TreeNode tn = e.Node;
                //create a datatable with two columns
                  DataTable aTable = new DataTable();
                    aTable.Columns.Add("Headid", typeof(string));
                    aTable.Columns.Add("HeadName", typeof(string));


                //in this for each loop we will traverse through the clicked tree node 
                // and get all child nodes name and tag(value) and keep it in datarow 
                // of our datatable .        
                foreach (TreeNode t1 in tn.Nodes)
                {
                    DataRow dr;
                    dr = aTable.NewRow();
                    dr[0] = t1.Text;
                    dr[1] = t1.Tag.ToString();
                    aTable.Rows.Add(dr);
                }
                //finally we will make datatabe as the source of listview
                ListViewItem li;
                foreach (DataRow rr in aTable.Rows)
                {
                    li = listView1.Items.Add(rr[0].ToString());
                    li.SubItems.Add(rr[1].ToString());
                }

i have CTE table in sql name is tblhead.i am populated the treeview but i have to show after click parent node in treeview parents realted child show in listview.
how can i do??? listview.tag (tag showing null).plz tell me soluation.

[edit]Code block added, "Treat my content as plain text..." option disabled - OriginalGriff[/edit]