using System;

using System.Collections.Generic;

public static class Ext {

    public static IEnumerable<T[]> Chunk<T>(this IEnumerable<T> values, int chunkSize)

    {

        T[] items = new T[chunkSize];

        int i = 0;

        var e = values.GetEnumerator();

        while (e.MoveNext())

        {

            items[i] = e.Current;

            i++;

​

            if (i == chunkSize) {

                yield return items;

                items = new T[chunkSize];

                i = 0;

           }

        }

        if (i != 0) //partial array remaining

        { 

           T[] final = new T[i];

       while (i>0) final[--i] = items[i];

           yield return final;

        }

    }   

}

​

public class Program

{

​

    public static void Main()

    {

        string stringContent = "Loremipsumdolorsitamet";

        var result = stringContent.Chunk(5);

        foreach(char[] segment in result)

        {

            foreach(char c in segment)

            {

                Console.Write(c);

            }

            Console.WriteLine();

        }

    }

}