WebConfiguration.cs

public class WebConfiguration
{
    public WebConfiguration(string path = "~", bool autoSave = true, bool autoRefresh = true)
    {
        if (string.IsNullOrWhiteSpace(path))
            throw new ArgumentNullException("path");

        _autoSave = autoSave;
        _autoRefresh = autoRefresh;
        _configuration = Open(path);
    }

    public void Compilation(bool debug = false)
    {
        const string sectionName = "system.web/compilation";
        CompilationSection section = GetSection<CompilationSection>(sectionName);

        section.Debug = debug;

        OnUpdated(section, sectionName);
    }

    public void Trace(bool enabled = true, bool localOnly = true, bool mostRecent = false, bool pageOutput = false, int requestLimit = 10, TraceDisplayMode traceDisplayMode = TraceDisplayMode.SortByTime, bool writeToDiagnosticsTrace = false)
    {
        const string sectionName = "system.web/trace";
        TraceSection section = GetSection<TraceSection>(sectionName);

        section.Enabled = enabled;
        section.LocalOnly = localOnly;
        section.MostRecent = mostRecent;
        section.PageOutput = pageOutput;
        section.RequestLimit = requestLimit;
        section.TraceMode = traceDisplayMode;
        section.WriteToDiagnosticsTrace = writeToDiagnosticsTrace;

        OnUpdated(section, sectionName);
    }

    public void Save()
    {
        _configuration.Save();
    }

    public void Restart()
    {
        System.Web.HttpRuntime.UnloadAppDomain();
    }

    private T GetSection<T>(string sectionName)
        where T : ConfigurationSection
    {
        ConfigurationSection section = _configuration.GetSection(sectionName);

        if (section == null)
            throw new ConfigurationErrorsException(string.Format("Section '{0}' not found in config file.", sectionName));

        if (section is T)
            return (T)section;

        throw new ConfigurationErrorsException(string.Format("Section '{0}' is not type '{1}'.", sectionName, typeof(T)));
    }

    private void OnUpdated(ConfigurationSection section, string sectionName)
    {
        if (_autoSave)
            Save();

        if (_autoRefresh)
            ConfigurationManager.RefreshSection(sectionName);
    }

    private static Configuration Open(string path = "~")
    {
        return WebConfigurationManager.OpenWebConfiguration(path);
    }

    private readonly Configuration _configuration;

    private readonly bool _autoSave;

    private readonly bool _autoRefresh;
}