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Changing Treeview property

Mike Collins
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I have six treeviews on a page. Each one is nested inside an accordion pane.
When I click on a node, it turns yellow. When I click on a node in another
tree, I would like the previous selected node to change back from yellow to
its original color. The two different ways I have tried below do not work. Am
I doing something wrong?

protected void tvAccountSetup_SelectedNodeChanged(object sender, EventArgs e)
    string cssStyle = "color: #FFFFFF; background: none; 
    tvProgram.SelectedNodeStyle.CssClass = cssStyle;
    if (tvProgram.SelectedNode != null)
        tvProgram.SelectedNodeStyle.BackColor = System.Drawing.Color.Beige;
        tvProgram.SelectedNode.Selected = false;
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