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

using System.Runtime.InteropServices;

namespace ConsoleApplication6
{
    class VCDLLTest6
    {
        [DllImport("VCDLLTest6.dll")]
        public static extern int myLength(string a);
        [DllImport("VCDLLTest6.dll")]
        public static extern int myChar8Change(StringBuilder a);
    }

    class Program
    {
        static void Main(string[] args)
        {
            StringBuilder strbuf = new StringBuilder();
            strbuf.Append("123456789");

            Console.WriteLine("myLength="
                             + VCDLLTest6.myLength(strbuf.ToString())
                             );

            Console.WriteLine("myChar8Change="
                             + VCDLLTest6.myChar8Change(strbuf)
                             );
            Console.WriteLine("strbuf=" + strbuf);
        }
    }
}