using System;
using System.Collections.Generic;
using System.Text;

namespace DllImportTest
{
    class Program
    {
        // DllImport属性をしてメソッドを定義
        [System.Runtime.InteropServices.DllImport("kernel32.dll")]
        public static extern bool GetComputerName(StringBuilder buffer, ref uint size);

        static void Main(string[] args)
        {
            StringBuilder buffer = new StringBuilder(256);
            uint size = 256;

            // API呼び出し
            if (GetComputerName(buffer, ref size))
            {
                System.Console.WriteLine("Computer name: {0}", buffer.ToString());
            }
            else
            {
                System.Console.WriteLine("GetComputerName() - error");
            }
        }
    }
}