using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<PurchasePayment> payments = new List<PurchasePayment>(){ new(1),new(2),new(3) };

        List<PurchaseBill> bills = new List<PurchaseBill>(){ new(1,1),new(1,1),new(1,1) };

        var result = payments.Where(x => bills.Where(a => a.PurchaseId == 2).Any(y => y.PurchaseBillId == x.PurchaseBillId)).Any();

        Console.WriteLine(result);

    }

}

​

public class PurchasePayment{

    public PurchasePayment(int PurchaseBillId){

        this.PurchaseBillId = PurchaseBillId;

    }

    public int PurchaseBillId {get;set;}

}

​

public class PurchaseBill{

    public PurchaseBill(int PurchaseId,int PurchaseBillId)

    {

        this.PurchaseId = PurchaseId;

        this.PurchaseBillId = PurchaseBillId;

    }

    public int PurchaseId {get;set;}

    public int PurchaseBillId {get;set;}

}