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When the user selects or unselects a Node checkbox, the NodeCheck event fires. The RadTreeNodeEventArgs has a Node property that can be used to get the current Checked property value of that Node.

protected void RadTreeView1_NodeCheck(object sender, Telerik.Web.UI.RadTreeNodeEventArgs e)
    e.Node.Text = e.Node.Checked.ToString();
Protected Sub RadTreeView1_NodeCheck(ByVal sender As Object, ByVal e As Telerik.Web.UI.RadTreeNodeEventArgs)
    e.Node.Text = e.Node.Checked.ToString()
End Sub

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