public string GetConfigurationSettingValueOrDefault(string configurationSettingName, string defaultValue)
        {
            if (!_configuration.ContainsKey(configurationSettingName))
            {
                string configValue = CloudConfigurationManager.GetSetting(configurationSettingName);
                bool   isEmulated  = Environment.CommandLine.Contains("iisexpress.exe") ||
                                     Environment.CommandLine.Contains("WebJob.vshost.exe");

                if (isEmulated && (configValue != null && configValue.StartsWith(ConfigToken, StringComparison.OrdinalIgnoreCase)))
                {
                    if (_environment == null)
                    {
                        LoadEnvironmentConfig();
                    }

                    configValue = _environment.GetSetting(
                        configValue.Substring(configValue.IndexOf(ConfigToken, StringComparison.Ordinal) + ConfigToken.Length));
                }
                try
                {
                    _configuration.Add(configurationSettingName, configValue);
                }
                catch (ArgumentException)
                {
                    // at this point, this key has already been added on a different
                    // thread, so we're fine to continue
                }
            }
            return(_configuration[configurationSettingName]);
        }
        public string GetConfigurationSettingValueOrDefault(string configurationSettingName, string defaultValue)
        {
            try
            {
                if (!_configuration.ContainsKey(configurationSettingName))
                {
                    string configValue = string.Empty;
                    bool   isEmulated  = true;
                    bool   isAvailable = false;
                    try
                    {
                        isAvailable = RoleEnvironment.IsAvailable;
                    }
                    catch (TypeInitializationException)
                    {
                    }
                    if (isAvailable)
                    {
                        configValue = RoleEnvironment.GetConfigurationSettingValue(configurationSettingName);
                        isEmulated  = RoleEnvironment.IsEmulated;
                    }
                    else
                    {
                        configValue = ConfigurationManager.AppSettings[configurationSettingName];
                        isEmulated  = Environment.CommandLine.Contains("iisexpress.exe") ||
                                      Environment.CommandLine.Contains("WebJob.vshost.exe");
                    }
                    if (isEmulated && (configValue != null && configValue.StartsWith(ConfigToken, StringComparison.OrdinalIgnoreCase)))
                    {
                        if (_environment == null)
                        {
                            LoadEnvironmentConfig();
                        }

                        configValue =
                            _environment.GetSetting(configValue.Substring(configValue.IndexOf(ConfigToken, StringComparison.Ordinal) + ConfigToken.Length));
                    }
                    try
                    {
                        _configuration.Add(configurationSettingName, configValue);
                    }
                    catch (ArgumentException)
                    {
                        // at this point, this key has already been added on a different
                        // thread, so we're fine to continue
                    }
                }
            }
            catch (RoleEnvironmentException)
            {
                if (string.IsNullOrEmpty(defaultValue))
                {
                    throw;
                }

                _configuration.Add(configurationSettingName, defaultValue);
            }
            return(_configuration[configurationSettingName]);
        }