RadTreeView for ASP.NET AJAX
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RadControls for ASP.NET AJAX

Use the following code to check whether a node or a treeview instance is returned by the get_parent() method:

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// node is root node and get_parent() returns the parent treeview
if (node.get_parent() == node.get_treeView())

or test the node level for zero:

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//node is a root node  
if (node.get_level() == 0)