private string GetLastedContractCode()
        {
            string result = "";

            try
            {
                _systemConfigService = new SystemConfigService();
                txtCode.Text         = _systemConfigService.GetLastContractNumberAsString();

                return(result);
            }
            catch (Exception)
            {
                throw;
            }
            finally
            {
                _systemConfigService = null;
            }
        }