using System;

using System.Collections.Generic;

​

​

static class StringExtensions {

​

  public static IEnumerable<string> SplitIt(this string str, int splitLength) {

    for (var i = 0; i < str.Length; i += splitLength)

      yield return str.Substring(i, Math.Min(splitLength, str.Length - i));

  }

​

}

​

public class Program

{

    public static void Main()

    {       

        var stringSections = "qwertyuiopasdfghjklzxcvbnmnbvcxzlkjhgfdsapoiuytrewq".SplitIt(2);

        Console.WriteLine(String.Join(" ", stringSections));

    }

}