How to set or get a frame using taglib#

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C#

.NET

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?