ini文件读写 保存上次存储内容

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace Face
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
        }

        //文件INI名称
        public string Path;

        //声明读写INI文件的API函数
        [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);

        //类的构造函数，传递INI文件名
        public void IniFile(string inipath)
        {
            // TODO: Add constructor logic here
            Path = inipath;
        }

        //写INI文件
        public void IniWriteValue(string Section, string Key, string Value)
        {
            WritePrivateProfileString(Section, Key, Value, this.Path);
        }

        //读取INI文件指定
        public string IniReadValue(string Section, string Key)
        {
            StringBuilder temp = new StringBuilder();
            int i = GetPrivateProfileString(Section, Key, "", temp, , this.Path);
            return temp.ToString();
        }       

        private void Form2_Load(object sender, EventArgs e)
        {   //打开窗体时读取ini文件