Hi,
I have resolved myself.
List<clsExtraPreviews> extraPrev = new List<clsExtraPreviews>();
IEnumerable<XElement> inner = xe.Elements("extra_previews").Elements("preview2_url");
clsExtraPreviews ObjRec;
foreach (var p in inner)
{
ObjRec = new clsExtraPreviews();
ObjRec.preview2_url = p.Value;
extraPrev.Add(ObjRec);
}