// Create an e-mail message.
// Create the 'From:' activity party for the email
ActivityParty fromParty = new ActivityParty
{ PartyId = new EntityReference(SystemUser.EntityLogicalName, new Guid("F6F5BB29-D519-E211-B109-B499BAFDBEDA"))
};// Create the 'To:' activity party for the email
ActivityParty toParty = new ActivityParty
{ PartyId = new EntityReference(SystemUser.EntityLogicalName, new Guid("F6F5BB29-D519-E211-B109-B499BAFDBEDA"))
};Email email = new Email
{ To = new ActivityParty[] { toParty }, From = new ActivityParty[] { fromParty }, Subject = "SDK Sample e-mail", Description = "SDK Sample for SendEmail Message.", DirectionCode = true
};
Guid _emailId = service.Create(email);QueryExpression mySavedQuery = new QueryExpression
{ ColumnSet = new ColumnSet(true), EntityName = WebResource.EntityLogicalName, Criteria = new FilterExpression() { Conditions = {                        new ConditionExpression { AttributeName = "name", Operator = ConditionOperator.Equal, Values = {"aw_testxml.xml"} } } }
};EntityCollection ec = service.RetrieveMultiple(mySavedQuery);
if (ec != null && ec.Entities != null && ec.Entities.Count > 0)
{ WebResource webresource = ec.Entities[0].ToEntity<WebResource>(); ActivityMimeAttachment _sampleAttachment = new ActivityMimeAttachment { ObjectId = new EntityReference(Email.EntityLogicalName, _emailId), ObjectTypeCode = Email.EntityLogicalName, Subject = "Sample Attachment", Body = webresource.Content, FileName = "ExampleAttachment.xml" };service.Create(_sampleAttachment);
}