nMail.Pop3.GetAttachmentFileStatus C# (CSharp) Метод

        public bool GetAttachmentFileStatus(int no)
        {
            if(_socket == (IntPtr)ErrorSocket) {
                throw new InvalidOperationException();
            }
            if(no <= 0) {
                throw new ArgumentOutOfRangeException();
            }
            SetHeaderSize();
            _part_id = new StringBuilder(_header_size);
            _part_no = Pop3GetAttachmentFileStatus(_socket, no, _part_id, _header_size);
            if(_part_no > 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }