students grades

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

namespace ConsoleApplication8
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("enter the number of students");
            int students = int.Parse(Console.ReadLine());
            Console.WriteLine("enter the number of Questions");
            int questions = int.Parse(Console.ReadLine());

            char[,] MCQ = new char[students, questions];
            char[] key = new char[questions];
            Console.WriteLine("enter the answer key");
            //input of the answer key
            for (int i = 0; i < key.Length; i++)
            {
                key[i] = char.Parse(Console.ReadLine());
            }

            //input of students answers
            for (int i = 0; i < students; i++)
            {
                Console.WriteLine("enter the answers of studnet {0}",i+1);
                for (int j = 0; j < questions; j++)
                {

                    MCQ[i, j] = char.Parse(Console.ReadLine());
                }

            }
            //ts7e7 el MCQ

            for (int i = 0; i < students; i++)
            {
                int counter = 0;
                for (int j = 0; j < questions; j++)
                {
                    if (MCQ[i,j]==key[j])
                    {
                        counter++;
                    }



                }
                Console.WriteLine("the number of correct answers for student {0} is {1}", (i + 1), counter);
            }

        }
    }
}