Creating Node Structure In-Line | RadTreeView for ASP.NET AJAX Documentation
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Creating Node Structure In-Line

You can define the RadTreeView structure inline, directly in the ASPX/ASCX file. To do this, enclose every RadTreeNode definition within the <telerik:RadTreeView> and </telerik:RadTreeView> tags. The example below has two root level nodes and a child node under the first root node. Notice in the markup for the RadTreeView that a <Nodes> tag surrounds one or more node definitions contained in <telerik:RadTreeNode> tags.

RadTreeView Node Structure

<telerik:RadTreeView RenderMode="Lightweight" ID="RadTreeView1" runat="server">
        <telerik:RadTreeNode runat="server" Text="My First Node">
                <telerik:RadTreeNode runat="server" Text="Child Node">
        <telerik:RadTreeNode runat="server" Text="My Second Node">

You can also use theRadTreeView Item Builder to interactively construct the RadTreeNode hierarchy.

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