public string GetUsing()
{
if (ns == null)
return null;
StringBuilder sb = new StringBuilder ();
// TODO:
//foreach (object x in ns.using_alias_list)
// sb.AppendFormat ("using {0};\n", x);
foreach (var ue in ns.Usings) {
sb.AppendFormat ("using {0};", ue.ToString ());
sb.Append (Environment.NewLine);
}
return sb.ToString ();
}