How to get or set a frame using taglib# in mp3

Question

i want get or set AuthorURL (WWWARTIST & 'WOAR') frame using taglib#
i have tried that code
for set frame
tag.SetTextFrame("WOAR", "SOME URL");


FOR get frame
TagLib.Id3v2.TextInformationFrame offcialartist_performerwebpage = TextInformationFrame.Get(tag, "WOAR", false);
string[] url=offcialartist_performerwebpage;


so how do i get or set frame?