程序代码：

using System;
using System.Collections.Generic;
using  System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using  读写XML文件
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void TTSkinLoad()
        {
            DataSet ds = new DataSet();
            ds.ReadXml(Application.StartupPath + @"\TTSkinSET.xml");
            textBox1.Text = ds.Tables[0].Rows[0][0].ToString();
        }
        private void TTSkinWrite()
        {
            DataSet ds = new DataSet();
            ds.ReadXml(Application.StartupPath + @"\TTSkinSET.xml");
            ds.Tables[0].Rows[0][0] = textBox1.Text;
            ds.WriteXml(Application.StartupPath + @"\TTSkinSET.xml");
        }


        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog openexe = new OpenFileDialog();
            openexe.Filter = "";
            if (openexe.ShowDialog() == DialogResult.OK)
            {
                textBox1.Text = openexe.FileName;
                TTSkinWrite();
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            if (File.Exists("TTSkinSET.xml"))
            {
                TTSkinLoad(); //调用
            }
            else
            {
                MessageBox.Show("设置文件不存在");
            }
        }
    }
}