C# soap xelement save

See more:

C#

XML

C#4.0

SOAP

I would ask you for your help!

DateTime date = Convert.ToDateTime("1900-01-01");
VisionSoapClient vsc = new VisionSoapClient();
System.Xml.Linq.XElement xdata = vsc.GetCikkek(date);
string path = "/ramiris/cikkek.xml";
xdata.Save(Server.MapPath(path));

I get the following error message is returned:

The IXmlSerializable type 'System.Xml.Linq.XElement' cannot be deserialized in
partial trust because it does not have a public parameterless constructor.

Please help!