Page Comparison

SalesforceSession salesforceSession = SessionTest.GetActiveSession();
ContactService contactService = new ContactService(salesforceSession);

AttachmentService attachmentService = new AttachmentService(salesforceSession);
 
//This is the Id for a contact directly from the browsers address bar
Id contactIdcreate a new contact
Contact contact = new Contact();
contact.FirstName = "John";
contact.LastName = "Doe";
SaveResult saveResult = contactService.SaveContact(contact);
string contactId = saveResult.id;


//create an attachment
Attachment attachment = new Id("00390000001TjMHAA0");
 
Contact contact = contactService.GetByEntityId(contactId, new SObjectField[] {Contact.Fields.Id, Contact.Fields.FirstName, Contact.Fields.LastName});
Assert.IsNotNull(contact);
Assert.AreEqual(contactId, contact.IdAttachment();
attachment.Name = "My attachment name";

//get the document as a byte array
byte[] bytes = System.IO.File.ReadAllBytes("MyPDF.pdf");
attachment.Body = bytes;

//set the Parent ID of the attachment to link it to the contact
attachment.ParentId = contactId;

//save the attachment
saveResult = attachmentService.Save(attachment);