using System;
using System.IO;
using System.Windows.Forms;
using System.Runtime.InteropServices;
 
namespace ConsoleApplication1
{
    partial class Program
    {
        static void WriteToIniFile()
        {
            string iniFilename = @"c:\temp\app1.ini";
 
            /* first WritePrivateProfile call 
             * implicitly creates the target INI file
             * if required
             */
 
            //if (!File.Exists(iniFilename))
            //{
            //    FileStream fs = new FileStream(iniFilename,
            //        FileMode.Create, FileAccess.ReadWrite);
            //    fs.Close();
            //}
 
            //writes entire section of INI file
 
            WritePrivateProfileSection("Environment",
                "Current Directory=" + 
                    Environment.CurrentDirectory + (char)0 +
                "System Directory=" + 
                    Environment.SystemDirectory + (char)0 +
                "User Name=" + 
                    Environment.UserName + (char)0 +
                "Machine Name=" + 
                    Environment.MachineName + (char)0 +
                "OS Version=" + 
                    Environment.OSVersion + (char)0,
                iniFilename);
 
            WritePrivateProfileSection("Application",
                "Company=" + 
                    Application.CompanyName + (char)0 +
                "Product=" + 
                    Application.ProductName + (char)0 +
                "Version=" + 
                    Application.ProductVersion + (char)0 +
                "Startup path=" + 
                    Application.StartupPath + (char)0 +
                "Culture=" + 
                    Application.CurrentCulture.DisplayName + (char)0,
                iniFilename);
 
            //writes a string into a specified section of INI file
            WritePrivateProfileString("Event Log", "File Created",
                DateTime.Now.ToString(), iniFilename);
        }
 
        [DllImport("kernel32.dll",
            CharSet = CharSet.Unicode, SetLastError = true)]
        static extern bool WritePrivateProfileSection(
            string lpAppName, string lpString,
            string lpFileName);
 
        [DllImport("kernel32.dll",
            CharSet = CharSet.Unicode, SetLastError = true)]
        static extern bool WritePrivateProfileString(
            string lpAppName, string lpKeyName,
            string lpString, string lpFileName);
 
    }
}