Question

In my ASP.NET application, used Treeview control with check box enabled. In that treeview if i checked treenode want to show different color in specific checked node. see below

 foreach (treenode node in treeview.nodes)
 {
    if (node.checked == true)
    {
      "change the color of the node" 
    }   
 }

i used to check the nodes like this below coding . but no tag to color change of checked nodes

    protected void TreeView1_TreeNodeCheckChanged(object sender, TreeNodeEventArgs e)
    {           

        if (e.Node.ChildNodes.Count > 0)
        {
            CheckAllChildNodes(e.Node, e.Node.Checked);
        }

        if (e.Node.ChildNodes.Count == 0)
        {
            CheckAllParentNodes(e.Node);
        }
     }

     private void CheckAllChildNodes(System.Web.UI.WebControls.TreeNode treeNode, bool nodeChecked)
    {
        foreach (System.Web.UI.WebControls.TreeNode node in treeNode.ChildNodes)
        {
            node.Checked = nodeChecked;

            if (node.ChildNodes.Count > 0)
            {
                this.CheckAllChildNodes(node, nodeChecked);
            }
        }
    }
    private void CheckAllParentNodes(System.Web.UI.WebControls.TreeNode treeNode)
    {
        if (treeNode.Parent != null)
        {
            if (treeNode.Checked == false)
            {
                treeNode.Parent.Checked = false;
                CheckAllParentNodes(treeNode.Parent);
            }
        }
    }

Please help me to solve this thing ..

Answer 1

If i understand your question clearly that is a bit tricky, you have to do following steps

1) Set the text of each node of your tree view like this

<asp:TreeNode Text='<font color="Red"> Test Inner 1</font>' Value="1"></asp:TreeNode>

2) Use following code in code behind

protected void TreeView1_SelectedNodeChanged(object sender, EventArgs e)
{
    if(Session["lastNode"] != null)
    {
       TreeNode lastNode = Session["lastNode"] as TreeNode;

       TreeNode tn = TreeView1.FindNode(Server.HtmlEncode(lastNode.ValuePath));
       tn.Text = tn.Text.Replace(@"color=""Red""", @"color=""Blue""");

     }

    Session["lastNode"] = TreeView1.SelectedNode;
}