MidiSheetMusic.MidiFile.FindHighLowNotes C# (CSharp) Method

        private static void FindHighLowNotes(List<MidiNote> notes, int measurelen, int startindex, 
                     int starttime, int endtime, ref int high, ref int low)
        {
            int i = startindex;
            if (starttime + measurelen < endtime) {
            endtime = starttime + measurelen;
            }

            while (i < notes.Count && notes[i].StartTime < endtime) {
            if (notes[i].EndTime < starttime) {
                i++;
                continue;
            }
            if (notes[i].StartTime + measurelen < starttime) {
                i++;
                continue;
            }
            if (high < notes[i].Number) {
                high = notes[i].Number;
            }
            if (low > notes[i].Number) {
                low = notes[i].Number;
            }
            i++;
            }
        }