Need Programming Help ASAP

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using System;
using System.Collections.Generic;
using System.Text;

class Program
    {
        static void Main(string[] args)
        {

            Selector();
        }

        private static void Selector()
        {
            string sRepeat;
            string sFunction;
            Console.WriteLine("Choose a program");
            Console.WriteLine("1: String Repeater");
            Console.WriteLine("2: Sums");
            Console.WriteLine("3: Character Counter");

            sFunction = Console.ReadLine();

            switch (sFunction) {
                case "1": 
                    {
                        F1();
                        break;
                    }

                case "2":
                    {
                        F2();
                        break;
                    }
                case "3":
                    {
                        F3();
                        break;
                    }

            }

            Console.Write("\nWould you like to try again?[Y/N]");
            sRepeat = Console.ReadLine();
            if (sRepeat.ToLower() == "y")
            {
                Selector();
            } 

        }

        private static void F1()
        {
            //F1 - Repeat string
            //(no parameters)

            int iNumberOfWrites;
            string s;

            try
            {
                Console.WriteLine("String to repeat:");
                s = Console.ReadLine();
                Console.WriteLine("Number of times to print it:");
                iNumberOfWrites = Convert.ToInt32(Console.ReadLine());
            }
            catch (Exception e)
            {
                Console.WriteLine("The following error occurred:\n{0}", e.Message);
                Console.WriteLine("Invalid Input.");
                return;
            }

            for (int j = 1; j <= iNumberOfWrites; j++)
            {
                Console.WriteLine(s);
            }
        }

        private static void F2()
        {
            //F2 - SumTotal, SumOdd, and SumEven
            //(no parameters)
            
            Int16 iNumberInput;
            long iSumTotal =0;
            long iSumEven =0;
            long iSumOdd=0;
            bool isOdd;

            try
            {
                Console.WriteLine("Enter your number:");
                iNumberInput = Convert.ToInt16(Console.ReadLine());
            }
            catch (Exception e)
            {
                Console.WriteLine("Invalid Input");
                return;
            }

            // Math works much better...
            iSumTotal = (iNumberInput+1) * iNumberInput / 2;
            iSumEven = Convert.ToInt32(Math.Pow(iNumberInput / 2, 2) + iNumberInput / 2);
            iSumOdd = Convert.ToInt32(Math.Pow((iNumberInput+1) / 2, 2));
            //Adjust for negative input
            iSumTotal = Math.Sign(iNumberInput) * iSumTotal;
            iSumOdd = Math.Sign(iNumberInput) * iSumOdd;
            iSumEven = Math.Sign(iNumberInput) * iSumEven;

            iSumTotal = 0;  //resetting because they're used below
            iSumOdd = 0;    //resetting because they're used below
            iSumEven = 0;   //resetting because they're used below
            //...but here goes the hard way.


            isOdd = true;
            for (int j = 1; j <= Math.Abs(iNumberInput); j++)
            {

                iSumTotal = iSumTotal + j;

                // start at 1, which is odd 
                iSumOdd = iSumOdd + j * Convert.ToInt32(isOdd);
                iSumEven = iSumEven + j * Convert.ToInt32(!isOdd);
                
                // flip boolean
                isOdd = !isOdd;
            }

            //Adjust for negative input
            iSumTotal = Math.Sign(iNumberInput) * iSumTotal;
            iSumOdd = Math.Sign(iNumberInput) * iSumOdd;
            iSumEven = Math.Sign(iNumberInput) * iSumEven;

            Console.WriteLine("Sum Total: {0}", iSumTotal);
            Console.WriteLine("Sum Even: {0}", iSumEven);
            Console.WriteLine("Sum Odd: {0}", iSumOdd);

        }

        private static void F3()
        {
            //F3 - Count Vowels and Consonants
            //(no parameters)
            int iNumVowels = 0;
            int iNumConsonants = 0;
            string s;

            try
            {
                Console.WriteLine("String to parse:");
                s = Console.ReadLine().Trim().ToLower();
            }
            catch (Exception e)
            {
                Console.WriteLine("Invalid Input.");
                return;
            }

            //Loops are not the easiest way...
            //iNumVowels = s.Split(new char[] { 'a','e','i','o','u' }).Length - 1;
            //iNumConsonants = s.Split(new char[] { 'b','c','d','f','g','h','j','k','l','m','n','p','q  ','r','s','t','v','w'}).Length - 1;
            //...but we'll use them anyway.
            for (int j = 0; j < s.Length; j++)
            {

                if (s.Substring(j, 1).IndexOfAny(new char[] {'a','e','i','o','u' }) == 0)
                {
                    iNumVowels++;
                }
                else if (s.Substring(j, 1).IndexOfAny(new char[] { 'b','c','d','f','g','h','j','k','l','m','n','p','q  ','r','s','t','v','w'}) == 0)
                {
                    iNumConsonants++;
                }

                
            }

            Console.WriteLine("There are {0} vowels and {1} consonants.", iNumVowels, iNumConsonants);
        }
    
    }