using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var List_1 =  new List<int> { 1, 2, 3 };

var List_2 = new List<int> { 4, 5, 6 };

​

var TargetList = new List<MyTable>();

TargetList.Add(new MyTable(){Key1=1,Key2=4});

​

var index1=0;

var List1 = List_1.Select(x=>new { ind=index1++,value=x });

var index2=0;

var List2 = List_2.Select(x=>new { ind=index2++,value=x });

​

var values = from l1 in List1

             join l2 in List2 on l1.ind equals l2.ind

             select new {value1=l1.value,value2=l2.value };

​

var result = TargetList.Where(x=>values.Any(y=>y.value1==x.Key1&&y.value2==x.Key2)).ToList();

​

result.Dump();

    }

}

​

public class MyTable

{

   public int Key1 { get; set; }

   public int Key2 { get; set; }

}

​