mattn.cs

using System;
using System.Runtime.InteropServices;

namespace mattn
{
    class Program
    {
        static void Main(string[] args)
        {
            IntPtr h = NativeMethods.GetStdHandle(STD_OUTPUT_HANDLE);
            COORD coord = new COORD(80, 31);
            bool b = NativeMethods.SetConsoleScreenBufferSize(h, coord);
            Console.WriteLine(b);
        }

        internal const int STD_OUTPUT_HANDLE = -11;

        internal static class NativeMethods
        {
            [DllImport("kernel32.dll", SetLastError = true)]
            internal static extern IntPtr GetStdHandle(int nStdHandle);

            [DllImport("kernel32.dll", SetLastError = true)]
            internal static extern bool SetConsoleScreenBufferSize(IntPtr hConsoleOutput, COORD size);
        }

        internal struct COORD
        {
            internal short X;
            internal short Y;

            internal COORD(short x, short y)
            {
                this.X = x;
                this.Y = y;
            }
        }
    }
}