Finding the intersection of time periods

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingsystem.web;usingSystem.Web.UI;usingSystem.Web.UI.WebControls; Public Partial classdefault7:system.web.ui.page{protected voidPage_Load (Objectsender, EventArgs e) {List<keyvaluepair<datetime, datetime>> timeSegments1 =NewList<keyvaluepair<datetime, datetime>>(); Timesegments1.add (NewKeyvaluepair<datetime, datetime> (DateTime.Parse ("2015-11-21 8:00:00"), DateTime.Parse ("2015-11-21 9:00:00"))); Timesegments1.add (NewKeyvaluepair<datetime, datetime> (DateTime.Parse ("2015-11-21 9:30:00"), DateTime.Parse ("2015-11-21 10:00:00"))); Timesegments1.add (NewKeyvaluepair<datetime, datetime> (DateTime.Parse ("2015-11-21 10:30:00"), DateTime.Parse ("2015-11-21 12:00:00"))); List<keyvaluepair<datetime, datetime>> timeSegments2 =NewList<keyvaluepair<datetime, datetime>>(); Timesegments2.add (NewKeyvaluepair<datetime, datetime> (DateTime.Parse ("2015-11-21 8:30:00"), DateTime.Parse ("2015-11-21 9:20:00"))); Timesegments2.add (NewKeyvaluepair<datetime, datetime> (DateTime.Parse ("2015-11-21 9:30:00"), DateTime.Parse ("2015-11-21 10:40:00"))); varOBJS =getuniontime (TimeSegments1, timeSegments2); intCount =1; foreach(varIteminchObjs) {Response.Write (string. Format ("{2} start time: {0} end time:{1}<br/>", item. Key, item.            Value, Count)); Count++; }    }    PrivateKeyvaluepair<datetime, Datetime>?getuniotimesegment (DateTime fromTime1, DateTime toTime1, DateTime fromTime2, datetime toTime2) {
    if(fromTime1 >= toTime1 | | fromTime2 >=toTime2)Throw NewException ("The time size violates the rule, and there is a situation where the start time is greater than the end time! "); KeyValuePair<datetime, Datetime>? Resulttimesegment =NULL; //1 contains 2        if(fromTime1 <= fromTime2 && toTime2 <=toTime1) {resulttimesegment=NewKeyvaluepair<datetime, datetime>(fromTime2, toTime2); }        //2 contains 1        if(FromTime2 < fromTime1 && toTime1 <=toTime2) {resulttimesegment=NewKeyvaluepair<datetime, datetime>(fromTime1, toTime1); }        //12 Crossover, 1 left, 2 right        if(fromTime1 <= fromTime2 && fromTime2 <= toTime1 && toTime1 <=toTime2) {resulttimesegment=NewKeyvaluepair<datetime, datetime>(fromTime2, toTime1); }        //21 Crossover, 2 left, 1 right        if(fromTime2 <= fromTime1 && fromTime1 <= toTime2 && toTime2 <=toTime1) {resulttimesegment=NewKeyvaluepair<datetime, datetime>(fromTime1, toTime2); }        returnresulttimesegment; }    PrivateKeyvaluepair<datetime, Datetime>?getuniotimesegment (KeyValuePair<datetime, datetime> timeSegment1, Keyvaluepair<datetime, datetime>TimeSegment2) {        returngetuniotimesegment (Timesegment1.key, Timesegment1.value, Timesegment2.key, Timesegment2.value); }    PrivateList<keyvaluepair<datetime, datetime>>Getuniontime (List<keyvaluepair<datetime, datetime>> timeSegments1, List<keyvaluepair<datetime, DateTime>>timeSegments2) {List<keyvaluepair<datetime, datetime>> resulttimesegments =NewList<keyvaluepair<datetime, datetime>>(); foreach(Keyvaluepair<datetime, Datetime> timeSegment1inchtimeSegments1) {            foreach(Keyvaluepair<datetime, Datetime> TimeSegment2inchtimeSegments2) {KeyValuePair<datetime, Datetime>? Timesegment =getuniotimesegment (TimeSegment1, TimeSegment2); if(Timesegment.hasvalue) Resulttimesegments.add (Timesegment.value); }        }        returnresulttimesegments; }}

Finding the intersection of time periods