c# - Iterate through list in paged manner, within another loop -

i have 3 collections. first, collection of days. next, collection of time spans in each day. these time spans same each day. next, have collection of sessions.

there 4 days. there 6 time spans. there 30 sessions.

i need iterate through each day, assigning of time spans each day same way each day. however, need assign sessions time blocks in sequence. example, day 1 gets 6 time spans, first 6 sessions, 1-6. day 2 gets same time spans, gets next 6 sessions, 7-12.

how can within same method?

here's have far, i'm having trouble wrapping head around paged iteration part.

var timeslots = timeslotdataaccess.getitems(codecampid); var assignableslotcount = timeslots.where(t => !t.spanalltracks);  // determine how many days event lasts agenda.numberofdays = (int)(agenda.codecamp.enddate - agenda.codecamp.begindate).totaldays;  // iterate through each day agenda.eventdays = new list<eventdayinfo>(agenda.numberofdays);  var daycount = 0; while (daycount <= agenda.numberofdays) {     var eventdate = agenda.codecamp.begindate.adddays(daycount);      var eventday = new eventdayinfo()     {         index = daycount,         day = eventdate.day,         month = eventdate.month,         year = eventdate.year,         timestamp = eventdate     };      // iterate through each timeslot     foreach (var timeslot in timeslots)     {         var slot = new agendatimeslotinfo(timeslot);          // iterate through each session         // first day gets first set of assignabletimeslotcount, next iteration gets next set of count, etc.         slot.sessions = sessiondataaccess.getitemsbytimeslotid(slot.timeslotid, codecampid).tolist();          // iterate through each speaker         foreach (var session in slot.sessions)         {             session.speakers=speakerdataaccess.getspeakersforcollection(session.sessionid, codecampid);         }     }      agenda.eventdays.add(eventday);      daycount++; } 

i ended using linq in new method based upon getitemsbytimeslot() method. new signature , example of getting matching subset of collection below.

here's how i'm calling it:

slot.sessions = sessiondataaccess.getitemsbytimeslotidbypage(slot.timeslotid,  codecampid, daycount + 1, timeslotcount).tolist(); 

here's looks like:

public ienumerable<sessioninfo> getitemsbytimeslotidbypage(int timeslotid, int codecampid, int pagenumber, int pagesize) {     var items = repo.getitems(codecampid).where(t => t.timeslotid == timeslotid);      items.select(s => { s.registrantcount = getregistrantcount(s.sessionid); return s; });      // important part     var resultset = items.skip(pagesize * (pagenumber - 1)).take(pagesize);      foreach (var item in resultset)     {         item.speakers = speakerrepo.getspeakersforcollection(item.sessionid, item.codecampid);     }      return resultset; }