using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var wordCollection =  GetWordsFrequencyCount("My bike and my book");

            foreach (var item in wordCollection)

            {

                Console.WriteLine("\"{0}\": {1}",item.Key,item.Value);

            }

​

            var wordlenghtCollection = GetWordsLengthFrequencyCount("My bike and my book");

​

            foreach (var item in wordlenghtCollection)

            {

                Console.WriteLine("{0}: {1}",item.Key,item.Value);

            }

    }

    static Dictionary <string, int> GetWordsFrequencyCount(string text)

        {

            Dictionary<string, int> wordCollection = new Dictionary<string, int>();

            var words = text.ToLower().Split(' ');

            foreach (var word in words)

            {

                if (wordCollection.ContainsKey(word))

                {

                    wordCollection[word]++;

                }

                else

                {

                    wordCollection.Add(word, 1);

                }

            }

            return wordCollection;

        }

​

        static Dictionary<int, int>  GetWordsLengthFrequencyCount(string text)

        {

            Dictionary<int, int> wordLenghtCollection = new Dictionary<int, int>();

            var words = text.ToLower().Split(' ');

            int wordLenght;

            foreach (var word in words)

            {

                wordLenght = word.Length;

                if (wordLenghtCollection.ContainsKey(wordLenght))

                {

                    wordLenghtCollection[wordLenght]++;

                }

                else

                {

                    wordLenghtCollection.Add(wordLenght, 1);

                }

            }

            return wordLenghtCollection;

        }

}