set attchment to a list in sharepoint 2013

if (ct.Attachment != null)

{

ct.DocumentName = ct.Attachment.ToString();

byte[] contents = GetFileStream();

if ((ct.DocumentName != null) && (contents.Length > 0))

{

SPAttachmentCollection fileAttach = empCertificationitem.Attachments;

if (ct.TemAttachmentName == System.IO.Path.GetFileName(ct.DocumentName))

{

empCertificationitem.Attachments.Delete(System.IO.Path.GetFileName(ct.DocumentName));

fileAttach.Add(ct.DocumentName, contents);

}

else

{

fileAttach.Add(ct.DocumentName, contents);

}

}

}










public byte[] GetFileStream()

{

Stream fStream = ct.stream;

byte[] contents = new byte[fStream.Length];

fStream.Read(contents, 0, (int)fStream.Length);

fStream.Close();

return contents;

}