private String lowerCase(VTDNav vn) { if (argCount1 == 1) { if (argumentList.e.NodeSet) { int a = evalFirstArgumentListNodeSet(vn); if (a == -1) return ""; else { try { int t = vn.getTokenType(a); if (t != VTDNav.TOKEN_STARTING_TAG && t != VTDNav.TOKEN_DOCUMENT) return vn.toStringLowerCase(a); return vn.getXPathStringVal2(a, (short)2); } catch (Exception e) { } return ""; } } else { return (argumentList.e.evalString(vn)).ToLower(); } } else throw new System.ArgumentException ("lowerCase()'s argument count is invalid"); }