public static class FileChangesMonitor
    {
        private static readonly PropertyInfo fileChangesMonitorProperty = typeof(HttpRuntime).GetProperty("FileChangesMonitor",
            BindingFlags.NonPublic | BindingFlags.Static);

        private static readonly FieldInfo callbackRenameOrCriticaldirChangeField = fileChangesMonitorProperty.PropertyType.
            GetField("_callbackRenameOrCriticaldirChange", BindingFlags.NonPublic | BindingFlags.Instance);

        private static object callbackRenameOrCriticaldirChange;

        /// <summary>
        /// Disables rename or critical-directory change monitoring.
        /// </summary>
        public static IDisposable Disable()
        {
            var fileChangesMonitor = GetFileChangesMonitor();
            callbackRenameOrCriticaldirChange = callbackRenameOrCriticaldirChangeField.GetValue(fileChangesMonitor);
            callbackRenameOrCriticaldirChangeField.SetValue(fileChangesMonitor, null);
            return new MonitoringDisabledScope();
        }

        /// <summary>
        /// Enable rename or critical-directory change monitoring.
        /// </summary>
        public static void Enable()
        {
            if (callbackRenameOrCriticaldirChange != null)
            {
                var fileChangesMonitor = GetFileChangesMonitor();
                callbackRenameOrCriticaldirChangeField.SetValue(fileChangesMonitor, callbackRenameOrCriticaldirChange);
                callbackRenameOrCriticaldirChange = null;
            }
        }

        /// <summary>
        /// Gets the current HttpRuntime.FileChangesMonitor property value.
        /// </summary>
        private static object GetFileChangesMonitor()
        {
            return fileChangesMonitorProperty.GetValue(null, null);
        }

        #region Nested type: MonitoringDisabledScope

        /// <summary>
        /// The scope inside which file changes monitoring is disabled.
        /// </summary>
        private class MonitoringDisabledScope : IDisposable
        {
            /// <inheritdoc />
            public void Dispose()
            {
                Enable();
            }
        }

        #endregion
    }