public void GetField()
        {
            _parent.doc.fat_inte = Int32.Parse(m_cli_cod.Text);
            _parent.doc.fat_dest = Int32.Parse(m_dst_cod.Text);

            try
            {
                int num = m_n_doc.Value == null ? 0 : Convert.ToInt32(m_n_doc.Value);
                _parent.doc.fat_n_doc = RsaUtils.GetStoredNumDoc(num, fat_registro.Text);
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex.Message);
            }

            _parent.doc.fat_registro = fat_registro.Text;
            _parent.doc.fat_d_doc    = m_d_doc.Date;
        }