ASP.NET Treeview Image background - asp.net

Question

I have a tree view control that I would like to supply the background image for. My code currently looks like this:
<asp:Image ImageUrl="~/images/mypic.gif" runat="server" Width="150px" />
<asp:TreeView ID="TreeView1" runat="server" DataSourceID="SiteMapDataSource1"
ImageSet="Arrows">
<ParentNodeStyle Font-Bold="False" />
<HoverNodeStyle Font-Underline="True" ForeColor="#5555DD" />
<SelectedNodeStyle Font-Underline="True"
HorizontalPadding="0px" VerticalPadding="0px" ForeColor="#5555DD" />
<NodeStyle Font-Names="Verdana" Font-Size="8pt" ForeColor="Black"
HorizontalPadding="5px" NodeSpacing="0px" VerticalPadding="0px" />
</asp:TreeView>

Answer 1

there is a property of the treeview CssClass that you can give it an image via css
<asp:TreeView ID="TreeView1" runat="server" DataSourceID="SiteMapDataSource1"
CssClass="classname" ImageSet="Arrows">
<ParentNodeStyle Font-Bold="False" />
<HoverNodeStyle Font-Underline="True" ForeColor="#5555DD" />
<SelectedNodeStyle Font-Underline="True"
HorizontalPadding="0px" VerticalPadding="0px" ForeColor="#5555DD" />
<NodeStyle Font-Names="Verdana" Font-Size="8pt" ForeColor="Black"
HorizontalPadding="5px" NodeSpacing="0px" VerticalPadding="0px" />
</asp:TreeView>
then in css
.classname
{
background-image: url('image path');
}

Answer 2

I would think the best way to achieve this would be to use CSS. I do not know off the top of my head what sort of html the TreeView control spits out but if it is a block element you should be able to set the background property to display your image.
An easy way to do this would be to surround your Treeview in a <div> block and set the css styling on this.
<div id="treeNav">
<asp:TreeView .........
</asp:TreeView>
</div>
#treeNav
{
background-image: url(my-image.png);
}