using System;

​

using System.Linq;

​

public class Program

{

    public static void Main()

    {   Error:

        Console.WriteLine("How many people are in your class? ");

        string answer = Console.ReadLine();

    int classSize;

     if (int.TryParse(answer, out classSize))

     {

        string[] students = new string[classSize];

        for(int i = 0; i < classSize; i++)

        {Console.WriteLine("Please enter person "+ (i+1));

            students[i] = Console.ReadLine();

        Console.Clear();

        }

        Array.Sort(students);

        Console.WriteLine("The people in your class in alphabetical order are: " );

        foreach(string name in students)

        {

            Console.Write(name+  "  ");

        }

     }

         else

         {   Console.Clear();

         Console.WriteLine("Error: you entered something invalid");

         goto Error;

         }

        }

    }

​

​