LINQ:
*LINQ
*Any
*Zip
*Min
*Cast
*All
*Sum
*Take
*Max
*Skip
*Last
*Join
var tens = new[] {10,20,30,40,50};
var units = new[] {1,2,3,4,5};
var sums = tens.Zip(units, (first, second) => first + second);
Console.WriteLine(string.Join(",", sums));
//11,22,33,44,55