XPATH Limit number of results

string l_search_string = @"//User[contains(translate(.,'abcdefghijklmnopqrstuvwxyz','ABCDEFGHIJKLMNOPQRSTUVWXYZ'),'" + l_search + "')]";
XmlNodeList l_list = l_doc.DocumentElement.SelectNodes(l_search_string);

I am doing a User Search and want to limit the number of result to say 10, is this possible using XPATH?

So if l_search is 'William' and there are 1000 williams I only want the frst 10

I tried adding [position () >= 10] but that does not give the desired result

I pass the result set to a DataList which displays results on a web page so i only want to display 10

Thanks

wc