C# (C Sharp) - Program to Check entered character is vowel or not vowel

PROGRAM TO IMPLEMENT VOWEL ( TO CHECK ENTERED CHARACTER IS VOWEL OR NOT)
ALSO TO CHECK No. Of VOWEL CHARACTER ENTERED

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

namespace vowel
{

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

          
            int a=0, b=0;

            Console.WriteLine(" Enter the number of character  ");
            int tot = Convert.ToInt32(Console.ReadLine());

            char[] ch = new char[tot];
            Console.WriteLine(" Enter {0} Characters ", tot);

            for (int i = 0; i < tot; i++)
            {
                ch[i] = Convert.ToChar(Console.ReadLine());
            }

            for (int i = 0; i < tot; i++)
            {
                if (ch[i] == 'a' || ch[i] == 'e' || ch[i] == 'i' || ch[i] == 'o' || ch[i] == 'u' || ch[i] == 'A' || ch[i] == 'E' || ch[i] == 'I' || ch[i] == 'O' || ch[i] == 'U')
                {
                   
                    a++;
                }
                else
                {
                   
                    b++;
                }
            }

            Console.WriteLine(" No. of VOWEL is     {0}", a);
            Console.WriteLine(" No. of Non VOWEL is {0}", b);


            Console.ReadLine();



        }
    }
}