var loginQuery = from results in xdoc.Descendants("IODATA")
                                select new
                                {
                                    Name =                results.Element("USER").Attribute("fullname").Value,
                                    ReturnedLoginGuid = results.Element("LOGIN").Attribute("guid").Value,
                                    ReturnedProjects = results.Element("USER").Element("LASTMODULES").Descendants("MODULE")
                                };

LINQ to XML - Query multiple elements and attributes

xml

C#