using System;

using System.Linq;

​

public class Program

{

    public class BenefitPlan

    {

        public string Name;

        public DateTime PlanMinimumDate;

        public DateTime PlanMaximumDate;

    }

​

    public class Data

    {

        public DateTime ClaimMaximumDate;

        public DateTime ClaimMinimumDate;

        public BenefitPlan[] Plans;

        public Data(DateTime min, DateTime max)

        {

            ClaimMinimumDate = min;

            ClaimMaximumDate = max;

            Plans = new BenefitPlan[]{new BenefitPlan()

            {Name = "2015 Plan", PlanMinimumDate = new DateTime(2015, 1, 1), PlanMaximumDate = new DateTime(2015, 12, 31), }, new BenefitPlan()

            {Name = "2016 Jan", PlanMinimumDate = new DateTime(2016, 1, 1), PlanMaximumDate = new DateTime(2016, 1, 31), }, new BenefitPlan()

            {Name = "2016 Feb", PlanMinimumDate = new DateTime(2016, 2, 1), PlanMaximumDate = new DateTime(2016, 12, 31), }, new BenefitPlan()

            {Name = "2017 Plan", PlanMinimumDate = new DateTime(2017, 1, 1), PlanMaximumDate = new DateTime(2017, 12, 31), }, new BenefitPlan()

            {Name = "2018 Plan Jan", PlanMinimumDate = new DateTime(2018, 1, 1), PlanMaximumDate = new DateTime(2018, 1, 31), }, new BenefitPlan()

            {Name = "2018 Plan Feb", PlanMinimumDate = new DateTime(2018, 2, 1), PlanMaximumDate = new DateTime(2018, 12, 31), }};

        }

    }

​

    public static void Main()

    {

        var sampleClaimData = new Data(new DateTime(2017, 10, 1), new DateTime(2017, 11, 1));

        var plans = sampleClaimData.Plans.Where(x => (x.PlanMinimumDate <= sampleClaimData.ClaimMinimumDate && x.PlanMaximumDate >= sampleClaimData.ClaimMinimumDate) || (x.PlanMinimumDate <= sampleClaimData.ClaimMaximumDate && x.PlanMaximumDate >= sampleClaimData.ClaimMaximumDate) || (sampleClaimData.ClaimMinimumDate <= x.PlanMinimumDate && sampleClaimData.ClaimMaximumDate >= x.PlanMaximumDate)).ToList();

        plans.ForEach(x => Console.WriteLine(x.Name));

        Console.WriteLine("2");

        var plans2 = sampleClaimData.Plans.Where(x => x.PlanMinimumDate <= sampleClaimData.ClaimMaximumDate && x.PlanMaximumDate >= sampleClaimData.ClaimMinimumDate).ToList();

        plans2.ForEach(x => Console.WriteLine(x.Name));

    }

}