how perform low duplicate an vigilant noted serializable (in c#)?

i am attempting emanate clipboard smoke-stack c#. clipboard information stored system.windows.forms.dataobject objects. i wanted store any clipboard opening (idataobject) directly general list. due proceed bitmaps (seem be) stored i am pondering i need perform low duplicate initial before i supplement list.

i attempted binary serialization (see below) emanate low duplicate nonetheless given system.windows.forms.dataobject noted serializable serialization step fails. any ideas?

public idataobject getclipboarddata()
{
    memorystream memorystream = new memorystream();
    binaryformatter binaryformatter = new binaryformatter();
    binaryformatter.serialize(memorystream, clipboard.getdataobject());
    memorystream.position = 0;
    relapse (idataobject) binaryformatter.deserialize(memorystream);
}