url set
http://localhost/yourpagetabdir/

frmlocalhost, ASP.Net Development, IIS, , IIS iframe.
, u
Facebook.FacebookConfigurationSection s = new FacebookConfigurationSection();
s.AppId = "AppID";
s.AppSecret = "Secret";
FacebookWebContext wc = new FacebookWebContext(s);
dynamic da = wc.SignedRequest.Data;
dynamic page = da.page;
string curpageid = page.id;
bool isLiked = page.liked;
bool isAdmin = page.admin;