xml serialized object in viewstate

[Sarfraz Hooda]

I have created an object which can bind to Microsoft DataGrid no issues but
now i have to bind that object to a 3rd party Grid. When i bind my object to
that grid's datasource what it does internally is save my object in
viewstate. So my object has to be serializable in order to get stored in
viewstate. I am using code mentioned below for serialization but it gives me
this error when i try to bind it. I can see the serialized xmldocument
object after serialization and it is perfectly ok.

The type 'u' must be marked as Serializable or have a TypeConverter other
than ReferenceConverter to be put in viewstate.

My object is a collection I am wondering if I am missing something here.

Thanks
Sarfraz

public static XmlDocument GetobjAsXmlDocument(object obj)

{

XmlDocument retVal = new XmlDocument();

//Convert the obj into an Xml document

XmlSerializer ser = new XmlSerializer(obj.GetType()); StringBuilder sb = new
StringBuilder();

TextWriter writer = new StringWriter(sb);

ser.Serialize(writer, obj );

StringReader reader = new StringReader(writer.ToString());

//Read the Xml from the StringReader object

DataSet dst = new DataSet();

dst.ReadXml(reader);

retVal.LoadXml(dst.GetXml());

return retVal;

}