score:0

Accepted answer
tbauthor author =
    (from c in cdafile.root.elements(ns + "author")
    select new tbauthor
    {                           
        streetaddressline = c.xgetelement(".//streetaddressline", "default"),
        city = c.xgetelement(".//city", "default"),
        state = c.xgetelement(".//state", "default"),
        postalcode = c.xgetelement(".//postalcode", "default"),
        country = "us"
    })
    .firstordefault();

score:0

    streetaddressline = (string)c.element(ns + "assignedauthor").element(ns + "addr") == null ? "" : c.element(ns + "assignedauthor").element(ns + "addr").element(ns + "streetaddressline").value

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