using System.Collections.Generic;
public static void Main()
foreach(var item in func2(2,10))
public static int[] func(int start, int number)
int[] _number = new int[number];
for(int i=0; i<number; i++)
_number[i] = start + 2 * i;
public static IEnumerable<int> func2(int start, int number)
for(int i=0; i<number; i++)
yield return start + 2 * i;