Press space bar to continue

using System;

namespace DemoApp
{
    internal class Program
    {
        static void WaitForSpace()
        {
            while (Console.ReadKey(true).Key != ConsoleKey.Spacebar) ;
        }

        static void Main(string[] args)
        {
            Console.WriteLine("a sentence");
            WaitForSpace();
            Console.WriteLine("another sentence");
            WaitForSpace();
            Console.WriteLine("etc");
            WaitForSpace();
        }
    }
}