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How can we read app setting value from web.config in lightswitch desktop application
public class UserConfiguration
{
    [Key]
    public string ConfigKey { get; set; }
    public string ConfigValue { get; set; }


    public List<UserConfiguration> GetUserConfigurations()
    {
        return _getUserConfigurations();
    }

    private List<UserConfiguration> _getUserConfigurations()
    {
        var listOfConfigs = new List<UserConfiguration>();
        var allConfigs = ConfigurationManager.AppSettings;

        for (int i = 0; i < allConfigs.Count; i++)
        {
            var userConfig = new UserConfiguration();
            userConfig.ConfigKey = allConfigs.GetKey(i);
            userConfig.ConfigValue = allConfigs[i];
            listOfConfigs.Add(userConfig);
        }
        return listOfConfigs;
    }
}

[Query(IsDefault = true)]
    public IQueryable<UserConfiguration> GetUserConfigurations()
    {
        var userConfings = new UserConfiguration();
        return userConfings.GetUserConfigurations().AsQueryable();
    }