using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var z = SplitWordChunks("testtesttest test", 10);

        foreach(var x in z)

        Console.WriteLine(x);

    }

    public static IEnumerable<string> SplitWordChunks(string text, int maxSize)

        {

            List<string> result = new List<string>();

​

            string[] words = text.Split(' ');

            string currentChunk = "";

            for (int i = 0; i < words.Length;)

            {

                string currentWord = words[i];

                if (currentChunk.Length + currentWord.Length <= maxSize - 1)

                {

                    currentChunk += (currentChunk.Length > 0 ? " " : "") + currentWord;

                    i++;

                }

                else

                {

                    if (currentChunk.Length < maxSize / 2 || currentWord.Length > maxSize) //Split word

                    {

                        currentChunk += (currentChunk.Length > 0 ? " " : "") + currentWord.Substring(0, maxSize - currentChunk.Length - 1);

                        words[i] = currentWord.Substring(maxSize - currentChunk.Length);

                    }

                    result.Add(currentChunk);

                    currentChunk = "";

                }

            }

            result.Add(currentChunk);

​

            return result;

        }

}