Implement Stack Operation In C#

using System;
class Program {
    static void Main(string[] args) {
        int top = -1;
        int[] s = new int[10];
        Console.WriteLine("Enter The Size of The Stack");
        int MAX = Convert.ToInt16(Console.ReadLine());
        while (true) {
            Console.WriteLine("1.Push");
            Console.WriteLine("2.Pop");
            Console.WriteLine("3.Display");
            Console.WriteLine("4.Exit");
            Console.WriteLine("Enter your choice :");
            int ch = Convert.ToInt16(Console.ReadLine());
            switch (ch) {
                case 1:
                    if (top > MAX - 1) Console.WriteLine("... Stack Overflow ...");
                    else {
                        Console.WriteLine("Enter the item :");
                        int n = int.Parse(Console.ReadLine());
                        s[++top] = n;
                    }
                    break;
                case 2:
                    if (top == -1) Console.WriteLine(" ... Stack Underflow ...");
                    else {
                        Console.WriteLine("Popped item :" + s[top--]);
                    }
                    break;
                case 3:
                    if (top == -1) Console.WriteLine("... Stack underflow ...");
                    else {
                        Console.WriteLine("Elements in the stack");
                        for (int i = top; i >= 0; i--) Console.WriteLine(s[i]);
                    }
                    break;
                case 4:
                    return;
                default:
                    Console.WriteLine("Wrong Choice");
                    break;
            }
        }
    }
}