Please help me.

I have an external data source which is a list of ID's, I need a
reference to n element of that list. This is a XPath expression, it
works.

xdXDocument:GetDOM("name_od_datasource")/dfs:myFields/dfs:dataFields/dfs:name_od_datasource[n]/@S_ID

where n is the n element of a list.

That's great but how can I write something like that directly in Visual
Basic? Could you help me?

Simply I need a reference (from VB, not XPath) to n element of my list
(external data source). I tried for example, create a drop down list.
That drop down list is filling up by those elements but I still can't
get the n element of that drop down list (only the first one). I
suspect there is a direct method (without a drop down list) to get to n
element od external data source. I tried various methods but nothing
helped :(

I would be greatful if you could help me.