Dump the Extended ASCII character set to the console window using DllImport.

ExtendedASCIIConsole.cs

using System;
using System.Runtime.InteropServices;

namespace ConsoleTest
{
    class Program
    {
        public const int STD_OUTPUT_HANDLE = -11;

        public struct COORD
        {
            public short X;
            public short Y;
        }

        [DllImport("kernel32.dll")]
        public static extern IntPtr GetStdHandle(int nStdHandle);

        [DllImport("kernel32.dll")]
        public static extern bool WriteConsole(IntPtr hConsoleOutput, string lpBuffer,
            uint nNumberOfCharsToWrite, out uint lpNumberOfCharsWritten,
            IntPtr lpReserved);
        
        [DllImport("kernel32.dll")]
        public static extern bool WriteConsoleOutputCharacter(IntPtr hConsoleOutput,
            string lpCharacter, uint nLength, COORD dwWriteCoord,
            out uint lpNumberOfCharsWritten);
        
        static void Main(string[] args)
        {
            IntPtr hOutput = GetStdHandle(STD_OUTPUT_HANDLE);

            COORD p = new COORD();
            uint num;
            for (int index = 0; index < 256; index++)
            {
                WriteConsoleOutputCharacter(hOutput, new string((char)index, 1), 1, p, out num);
                p.X++;
                if (p.X > 40)
                {
                    p.X = 0;
                    p.Y++;
                }
            }
            
            Console.ReadKey();
        }
    }
}