How to Attach Annotation File to Email Attachment in Crm 2011

Hi,

I have a requirement to attach lead annotation content to email attachments. 

i can able to retrieve annotation file , but while setting into activitymimeattachment itz not able to set. 

using bellow link . 

http://www.resultondemand.nl/support/sdk/4c27c9ae-c0e8-4de4-bba7-bf957a873ff5.htm

here i am getting annotation id and setting in activitymime. 

ActivityMimeAttachment _reuseAttachment = new ActivityMimeAttachment
{
   ObjectId = new EntityReference("annotation", "GUID"),
   ObjectTypeCode = "annotation",

   Subject = "Sample Attachment,AttachmentId = retrievedAttachment.annotationID
};

Grateful for any help!!