<p>The new Vista Audio subsystem is set up to be a chain of devices starting with the inputs, going through all the various controls (like mixers and volumen controls) and then ending up at various endpoints (like speakers or headphones).</p>

<p>My question is: Is there a tool out there that will show all the endpoints devices in the system, and what devices are chained together?  Ideally, it would diagram the topology, showing what inputs where connected to what outputs, and you would be able to see all the properties for each part of the audio system.</p>

Here's how to add a value at the top of the list. It can be an empty string, or some text.
```
```
<asp:DropDownList ID="categories" runat="server" AppendDataBoundItems="True" AutoPostBack="True" DataSourceID="categoriesDataSource" DataTextField="CategoryName" DataValueField="CategoryID" EnableViewState="False">
    <asp:ListItem Value="-1">
       -- Choose a Category --
    </asp:ListItem>           
</asp:DropDownList>
```
```
Be sure to set the DropDownList's AppendDataBoundItems=True.