C# - Checking Index values of two sets

Question

From two sets

var set1 =new int[] { 1, 2, 3 };
var set2 =new int[] { 100, 200, 300 };

How to check index value of elements in set1 and set 2 ? if index value of elements of set1 equals to index value of elements of set2 then i want that pair like

{1,100} ,{2,200},{3,300}.

Some incomplete code

var pairs=from n1 in set1 
          from n2 in (from num in set2 where ((num1,index)=> );

Answer 1

I am assuming you just want to join these two arrays. This is how I would do it

var pairs=from n1 in set1  
          from n2 in set2
          select new
          {
               n1,
               n2
          }

This will return both sets combined. This is assuming both sets are already sorted.

Answer 2

For example you can do:

var pairs=
  set1.Select((item, index) => new
  {
      n1= item, n2= set2[index]
  }).ToArray();

Or if set2 does not have an indexer, get n2 as follows:

n2 = set2.Skip(index).Take(1).Single()

Answer 3

Have a look at this

int[] set1 = {1, 2, 3};
int[] set2 = {100, 200, 300};

var t = from i1 in set1
     from i2 in set2
        where Array.IndexOf(set1, i1) == Array.IndexOf(set2, i2)
        select new int[] { i1, i2 };

Answer 4

This is called a "zip" operation. You can read more about it in this earlier Stack Overflow post.