XmlObjectSerializer.WriteEndObject Method (XmlWriter)
Writes the end of the object data as a closing XML element to the XML document or stream with an XmlWriter.
Assembly: System.Runtime.Serialization (in System.Runtime.Serialization.dll)
the type being serialized does not conform to data contract rules. For example, the DataContractAttribute attribute has not been applied to the type.
there is a problem with the instance being serialized.
the maximum number of objects to serialize has been exceeded. Check the MaxItemsInObjectGraph property.