Filtering an XML file by product name, displaying results in a datalist

I am working in ASP.Net (vb) with a client's XML file (reduced from 319 entries to 3):

 

<?xml version= "1.0"?>
<products>
	<product id="001">
		<division>Division1</division>
		<name>AName</name>
		<model>Model1</model>
		<category></category>
		<datathumbURL>image.jpg</datathumbURL>
		<datasheetURL>document.pdf</datasheetURL>
		<thumbURL>image.png</thumbURL>
		<fullImageURL></fullImageURL>
		<description>Many, many words here</description>
		<contactSnail>address, city, state, zip</contactSnail>
		<contactDigits>phone</contactDigits>
		<contactWebsite>URL</contactWebsite>
	</product>
	<product id="002">
		<division>Division2</division>
		<name>BName</name>
		<model>Model2</model>
		<category></category>
		<datathumbURL>image.jpg</datathumbURL>
		<datasheetURL>document.pdf</datasheetURL>
		<thumbURL>image.png</thumbURL>
		<fullImageURL></fullImageURL>
		<description>many, many words here</description>
		<contactSnail>address, city, state, zip</contactSnail>
		<contactDigits>phone</contactDigits>
		<contactWebsite>URL</contactWebsite>
	</product>
	<product id="003">
		<division>Division3</division>
		<name>CName</name>
		<model>Model3</model>
		<category></category>
		<datathumbURL>image.jpg</datathumbURL>
		<datasheetURL>document.pdf</datasheetURL>
		<thumbURL>image.png</thumbURL>
		<fullImageURL></fullImageURL>
		<description>man, many words here</description>
		<contactSnail>address, city, state, zip</contactSnail>
		<contactDigits>phone</contactDigits>
		<contactWebsite>URL</contactWebsite>
	</product>
</products>

Select allOpen in new window

... and have created the sort and display code which works as expected (sorting the list of 319 products by name, division or model):

<script runat="server">
	Sub Page_Load

		dim dsProducts = New DataSet
		dsProducts.ReadXml(MapPath("products.xml"))
		
		Dim sid As String
		sid = Request.QueryString("sid")	
			
		If String.IsNullOrEmpty(Request.QueryString("sid")) Then
			dsProducts.Tables(0).DefaultView.Sort = "name, division, model ASC"			
		Elseif sid = "div" Then
			dsProducts.Tables(0).DefaultView.Sort = "division, name, model ASC"
		Elseif sid = "mod" Then
			dsProducts.Tables(0).DefaultView.Sort = "model, name, division ASC"	
		End If
	
		Dim dsProductsSort = dsProducts.Tables(0).DefaultView.ToTable()
		dlProducts.DataSource = dsProductsSort
		dlProducts.DataBind()
	End sub
</script>

<asp:DataList id="dlProducts" runat="server">
	<ItemTemplate>
		<a href="products-details.aspx?id=<%#Container.DataItem("id")%>" style="color:blue"> <%#Container.DataItem("name")%> | <%#Container.DataItem("model")%></a> | <%#Container.DataItem("division")%> 
	</ItemTemplate>
</asp:DataList>

Select allOpen in new window

The client would now like a page that will allow clicking on a letter of the alphabet (A - B - C, etc...) to see a list of product names beginning with that letter.  In the example XML code these are listed as AName, BName and CName.

Ideally, the results would be shown in the same datalist included above.

Easy enough to do using a database - I can't seem to wrap my ahead around making it work using an XML file as the datasource.  Shuffling fields in the XML file is an option if required.

Help?