/// <summary>
        /// Enable a provider.
        /// </summary>
        /// <param name="provider_id">The GUID of the provider.</param>
        /// <param name="level">The level for the events.</param>
        /// <param name="match_any_keyword">Any keywords to match.</param>
        /// <param name="match_all_keyword">All keywords to match.</param>
        /// <param name="timeout">The timeout.</param>
        /// <param name="descriptors">List of optional descriptors.</param>
        /// <param name="throw_on_error">True to throw on error.</param>
        /// <returns>The resulting status code.</returns>
        public NtStatus EnableProvider(Guid provider_id, EventTraceLevel level, ulong match_any_keyword,
                                       ulong match_all_keyword, int timeout, IEnumerable <EventFilterDescriptor> descriptors, bool throw_on_error)
        {
            var ds = descriptors.Select(d => new EVENT_FILTER_DESCRIPTOR()
            {
                Ptr  = d.Ptr.ToInt64(),
                Size = d.Size,
                Type = d.Type
            }).ToArray();

            using (var buffer = ds.ToBuffer())
            {
                ENABLE_TRACE_PARAMETERS enable_trace = new ENABLE_TRACE_PARAMETERS
                {
                    Version          = 2,
                    SourceId         = SessionGuid,
                    EnableFilterDesc = buffer.DangerousGetHandle(),
                    FilterDescCount  = ds.Length
                };

                NtStatus status = Win32NativeMethods.EnableTraceEx2(
                    _handle,
                    ref provider_id,
                    EventControlCode.EnableProvider,
                    level,
                    match_any_keyword,
                    match_all_keyword,
                    timeout,
                    enable_trace
                    ).MapDosErrorToStatus().ToNtException(throw_on_error);
                if (status.IsSuccess())
                {
                    _providers.Add(new EnabledProvider()
                    {
                        ProviderId = provider_id, Level = level
                    });
                }
                return(status);
            }
        }