Using Database structure to populate TreeView in PreRender

[Rob]

Hi, I am trying to use database structure to populate Rad TreeView on PreRender after new item added, but I cannot see new node until I refresh the page. Please, help.

[Boyan Dimitrov]

Hello,

As far as I understood your scenario, you are trying to add a new node to the RadTreeView node's collection and then add a hierarchy structure of items to the RadTreeView object. Could you please try to use the AppendDataBoundItems="true". This will append the hierarchy structure of items instead of replacing the existing nodes.
//markup code

<telerik:RadTreeView ID="treeview1" runat="server" AppendDataBoundItems="true">
</telerik:RadTreeView>

//code behind

protected void Page_PreRender(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            treeview1.Nodes.Add(new RadTreeNode("added node"));

            SiteDataItem[] siteDataBus = new SiteDataItem[] {
               new SiteDataItem("1", null, "Node1"),
               new SiteDataItem("2", null, "Node2"),
               new SiteDataItem("3", "1", "Node 1.1")
           };
            treeview1.DataTextField = "Text";
            treeview1.DataValueField = "Id";
            treeview1.DataFieldID = "Id";
            treeview1.DataFieldParentID = "ParentID";
            treeview1.DataSource = siteDataBus;
            treeview1.DataBind();
        }
    }

Regards,
Boyan Dimitrov
Telerik