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

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()