求用C#修改XP壁纸方法

我曾试过用代码修改注册表以试图修改壁纸。想不到注册表参数修改成功，注销了后却发现壁纸变成了默认的（什么都没有）。有什么方法改壁纸吗？能不注销就更好了

答案：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;
using System.IO;
using System.Drawing.Imaging;
namespace APIdesktop
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        #region 调用API
        [DllImport("user32.dll", EntryPoint = "SystemParametersInfoA")]
        static extern Int32 SystemParametersInfo(Int32 uAction, Int32 uParam, string lpvparam, Int32 fuwinIni);
        private const int SPI_SETDESKWALLPAPER = 20;
        #endregion
        Form2  ;
        private void toolStripButton2_Click(object sender, EventArgs e)
        {
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                listView1.Items.Clear();
                string[] files = openFileDialog1.FileNames;
                string[] fileinfo = new string[3];
                for (int i = 0; i < files.Length; i++)
                {
                    string path = files[i].ToString();
                    string fileName = path.Substring(path.LastIndexOf("\\") + 1, path.Length - 1 - path.LastIndexOf("\\"));
                    string filetype = fileName.Substring(fileName.LastIndexOf(".") + 1, fileName.Length - 1 - fileName.LastIndexOf("."));
                    fileinfo[0] = fileName;
                    fileinfo[1] = path;
                    fileinfo[2] = filetype;
                    ListViewItem lvi = new ListViewItem(fileinfo);
                    listView1.Items.Add(lvi);
                }
            }
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            int x = this.Location.X;
            int y = this.Location.Y;
              = new Form2();
             .x = x + this.Width;
             .y = y;
             .Hide();
            openFileDialog1.Filter = "支持的图片格式|*.jpeg;*.png;*.bmp;*.jpg";
        }
        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            if (listView1.SelectedItems.Count > 0)
            {
                listView1.Items.RemoveAt(listView1.SelectedItems[0].Index);
            }
        }
        private void 添加ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            toolStripButton2_Click(sender, e);
        }
        private void 删除ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            toolStripButton1_Click(sender, e);
        }
        private void 清空ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            listView1.Items.Clear();
        }
        private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }
        private void 设为桌面背景ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (listView1.SelectedItems.Count > 0)
            {
                string FPath = listView1.SelectedItems[0].SubItems[1].Text;
                //获取指定图片的扩展名
                string SFileType = FPath.Substring(FPath.LastIndexOf(".") + 1, (FPath.Length - FPath.LastIndexOf(".") - 1));
                //将扩展名转换成小写
                SFileType = SFileType.ToLower();
                //获取文件名
                string SFileName = FPath.Substring(FPath.LastIndexOf("\\") + 1, (FPath.LastIndexOf(".") - FPath.LastIndexOf("\\") - 1));
                //如果图片的类型是bmp则调用API中

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