cycle error on cloning linq object

error: "Object graph for type 'TestLinq.PersonAddress' contains cycles and cannot be serialized if reference tracking is disabled.”

solution: change the 'Serialization Mode' to 'Unidirectional'.

source: http://stackoverflow.com/questions/1432501/clone-linq-object-error-object-graph-for-type-testlinq-personaddress-contains

clone linq object

///

/// Clones any object and returns the new cloned object.
///

/// The type of object.
///
The original object./// The clone of the object.
public static T Clone(T source)
{
var dcs = new DataContractSerializer(typeof(T));
using (var ms = new System.IO.MemoryStream())
{
dcs.WriteObject(ms, source);
ms.Seek(0, System.IO.SeekOrigin.Begin);
return (T)dcs.ReadObject(ms);
}
}

source:http://stackoverflow.com/questions/2178080/linq-to-sql-copy-original-entity-to-new-one-and-save