c# 如何讀取和寫入ini(設定檔)

using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Text;

namespace SendEmailSpace
{
    /// <summary>
    /// iniClass 的摘要說明。
    /// </summary>
    // TODO: 在此處添加建構函式邏輯
    public class INIClass
    {
        public string inipath;
        [DllImport("kernel32")]
        private static extern long WritePrivateProfileString(string section, string key, string val, string filePath);
        [DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string section, string key, string def, StringBuilder retVal, int size, string filePath);
        /// <summary>
        /// 構造方法
        /// </summary>
        /// <param name="INIPath">檔案路徑</param>
        public INIClass(string INIPath)
        {
            inipath = INIPath;
        }
        /// <summary>
        /// 寫入INI檔案
        /// </summary>
        /// <param name="Section">項目名稱(如 [TypeName] )</param>
        /// <param name="Key">鍵</param>
        /// <param name="Value">值</param>
        public void IniWriteValue(string Section, string Key, string Value)
        {
            WritePrivateProfileString(Section, Key, Value, this.inipath);
        }
        /// <summary>
        /// 讀出INI檔案
        /// </summary>
        /// <param name="Section">項目名稱(如 [TypeName] )</param>
        /// <param name="Key">鍵</param>
        public string IniReadValue(string Section, string Key)
        {
            StringBuilder temp = new StringBuilder(500);
            int i = GetPrivateProfileString(Section, Key, "", temp, 500, this.inipath);
            return temp.ToString();
        }
        /// <summary>
        /// 驗證檔案是否存在
        /// </summary>
        /// <returns>布爾值</returns>
        public bool ExistINIFile()
        {
            return File.Exists(inipath);
        }
    }

    //
}