Random Mutation of Information

using System;

namespace RandomMutation
{
    class MainClass
    {
        public static void Main (string[] args)
        {
            string startWord;
            Console.WriteLine ("What word do you want to start with?");
            startWord = (Console.ReadLine ()).ToLower ();

            string finishWord;
            Console.WriteLine ("What word do you want to finish with?");
            finishWord = (Console.ReadLine ()).ToLower ();

            int wordLength = startWord.Length;

            char[] generatedArray;
            generatedArray = new char[wordLength];
            generatedArray = startWord.ToCharArray ();

            bool continueOrEnd;

            int iterationCount = 1;

            Random rnd = new Random ();

            if ((startWord.Length) == (finishWord.Length)) {
                do {
                    int random = rnd.Next (0, wordLength);
                    int number = rnd.Next (1, 27);
                    if (number == 1) {
                        generatedArray.SetValue ('a', random);
                    } else if (number == 2) {
                        generatedArray.SetValue ('b', random);
                    } else if (number == 3) {
                        generatedArray.SetValue ('c', random);
                    } else if (number == 4) {
                        generatedArray.SetValue ('d', random);
                    } else if (number == 5) {
                        generatedArray.SetValue ('e', random);
                    } else if (number == 6) {
                        generatedArray.SetValue ('f', random);
                    } else if (number == 7) {
                        generatedArray.SetValue ('g', random);
                    } else if (number == 8) {
                        generatedArray.SetValue ('h', random);
                    } else if (number == 9) {
                        generatedArray.SetValue ('i', random);
                    } else if (number == 10) {
                        generatedArray.SetValue ('j', random);
                    } else if (number == 11) {
                        generatedArray.SetValue ('k', random);
                    } else if (number == 12) {
                        generatedArray.SetValue ('l', random);
                    } else if (number == 13) {
                        generatedArray.SetValue ('m', random);
                    } else if (number == 14) {
                        generatedArray.SetValue ('n', random);
                    } else if (number == 15) {
                        generatedArray.SetValue ('o', random);
                    } else if (number == 16) {
                        generatedArray.SetValue ('p', random);
                    } else if (number == 17) {
                        generatedArray.SetValue ('q', random);
                    } else if (number == 18) {
                        generatedArray.SetValue ('r', random);
                    } else if (number == 19) {
                        generatedArray.SetValue ('s', random);
                    } else if (number == 20) {
                        generatedArray.SetValue ('t', random);
                    } else if (number == 21) {
                        generatedArray.SetValue ('u', random);
                    } else if (number == 22) {
                        generatedArray.SetValue ('v', random);
                    } else if (number == 23) {
                        generatedArray.SetValue ('w', random);
                    } else if (number == 24) {
                        generatedArray.SetValue ('x', random);
                    } else if (number == 25) {
                        generatedArray.SetValue ('y', random);
                    } else {
                        generatedArray.SetValue ('z', random);
                    }
                    //turn the generated array into a string to allow for checking//
                    string generatedWord = (new string (generatedArray)).ToLower ();
                    //check to see if the generated word matches the user's word//
                    //if not, loop again, and keep a running count of the iterations//
                    //if yes, tell the user how many iterations it took to randomly generate the word//
                    if (finishWord == generatedWord) {
                        Console.WriteLine ("It took me {0} times to randomly mutate {1} into {2}.",
                                           iterationCount, startWord, finishWord);
                        continueOrEnd = false;
                    } else {
                        iterationCount = ++iterationCount;
                        continueOrEnd = true;
                    }
                } while(continueOrEnd == true);
            } else {
                Console.WriteLine ("I'm sorry, but {0} and {1} won't work: I need two words with " +
                    "the same amount of letters. Please try again.", startWord, finishWord);
            }
        }
    }
}