AJAX :: Using Autocomplete Extender To Return 'Value' And 'Text'?

I have been trying AJAX TOOK KIT 3.5

Used the following web service method, to get the users names from ms sql db which is working fine.

But is there a way to get the Value of the selected item, which is the primary key.

[System.Web.Services.WebMethodAttribute(), System.Web.Script.Services.ScriptMethodAttribute()]
public static string[] GetCompletionList(string prefixText, int count, string contextKey)
{
DataClassesDataContext db = new DataClassesDataContext();
return db.viwUsers.Where(n => n.FullName.Contains(prefixText)).OrderBy(n => n.FullName).Select(n => n.FullName).Take(count).ToArray();
}