SIPSorcery.SimpleWizardInRuleControl.SetRuleCommandFields C# (CSharp) Method

        private string SetRuleCommandFields(SimpleWizardRule rule)
        {
            if (rule.CommandType == SimpleWizardCommandTypes.Dial)
            {
                rule.CommandParameter1 = m_ruleCommandString.Text ?? "${EXTEN}";
                if (m_ruleProvider.SelectedValue == null || m_ruleProvider.SelectedValue as string == PLEASE_CHOOSE_OPTION)
                {
                    return "No provider was selected for the Dial command.";
                }
                else
                {
                    rule.CommandParameter2 = m_ruleProvider.SelectedValue as string;
                }
            }
            else if (rule.CommandType == SimpleWizardCommandTypes.DialAdvanced)
            {
                rule.CommandParameter1 = m_ruleAdvancedDialString.Text;
                rule.CommandParameter2 = m_ruleRingDuration.Text;
                rule.CommandParameter3 = m_ruleAnswerDuration.Text;
            }
            else if (rule.CommandType == SimpleWizardCommandTypes.Reject)
            {
                rule.CommandParameter1 = ((TextBlock)m_rejectResponseCode.SelectedValue).Text.Substring(0, 3);
                rule.CommandParameter2 = m_rejectReason.Text;
            }
            else if (rule.CommandType == SimpleWizardCommandTypes.HighriseLookup)
            {
                rule.CommandParameter1 = m_highriseURL.Text;
                rule.CommandParameter2 = m_highriseToken.Text;
                rule.CommandParameter3 = m_recordHighriseNote.IsChecked.ToString();
                rule.CommandParameter4 = m_asyncHighrise.IsChecked.ToString();
            }

            return null;
        }