Help with formatting a HyperLinkColumn in Datagrid

[hellswraith]

Here is what I am doing in a datagrid for the colums:

<Columns>
    <asp:HyperLinkColumn DataNavigateUrlField="CatID"
    DataNavigateUrlFormatString=
    "../VXForums/Index.aspx?CatID={0}" 
    DataTextField="CatName" HeaderText="Category">
    </asp:HyperLinkColumn>
    <asp:BoundColumn DataField="CatDescription" 
    HeaderText="Description">
    </asp:BoundColumn>
</Columns>

The problem I have is I want two values in the query string, both comming from the dataset that is databound to the datagrid. Right now, the link looks like this when ran:
../VXForums/Index.aspx?CatID=1
../VXForums/Index.aspx?CatID=2
etc...

I want it to look like this:
../VXForums/Index.aspx?CatID=1&SecID=8
../VXForums/Index.aspx?CatID=2&SecID=9
etc...

The SecID is comming from the dataset.

So the question is, how do I get two values from the dataset into the DataNavigateUrlFormatString property, and/or how do I get two values into the DataNavigateUrlField?

If you need more information, just ask, this is pretty important to the project.