请教各位大哥，winform登录后怎么把登录信息存到xml中？？？

Question

请教各位大哥，winform登录后怎么把登录信息存到xml中？？？
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Security.Cryptography;namespace WindowsApplication2
{
    public partial class Login : Form
    {        DataSet DS;
        DataTable DT;
        public Login()
        {
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {            string strConn = "Data Source=fbonn;Initial Catalog=biiz_DB;Integrated Security=True";
            string sql = " select * from userinfo ";
            sqlConnection1 = new SqlConnection(strConn);
            sqlDataAdapter1 = new SqlDataAdapter(sql, sqlConnection1);
            DS = new DataSet("UserName");
            sqlDataAdapter1.Fill(DS, "UserName");
            DT = DS.Tables["UserName"];
            for (int i = 0; i < DT.Rows.Count; i++)
            {
                // lblusername.Text.Add(DT.Rows[i]["UserName"]);
                // lblusername.TabIndex = 0;//显示数据库的第一行数据
            }
        }        private void button1_Click(object sender, EventArgs e)
        {
            string st;
            st = lblusername.Text.ToString();
            string strPwd = "";
            strPwd = lblpassword.Text.ToString();
            for (int i = 0; i < DT.Rows.Count; i++)
            {
                if (st.Trim() == DT.Rows[i]["UserName"].ToString().Trim())
                {
                    //if (strPwd.Trim() == DT.Rows[i]["Passwd"].ToString().Trim())
                    if (StringToMD5Hash(strPwd.Trim()) == DT.Rows[i]["Passwd"].ToString().Trim()) 
                    {                        this.DialogResult = DialogResult.OK;//成功                         //在Program.cs中写                        // static void Main()
                        //{
                        //Application.EnableVisualStyles();
                        //Application.SetCompatibleTextRenderingDefault(false);
                        // login  fm = new login();
                        //if (fm.ShowDialog() == DialogResult.OK)
                        // {
                        //  Application.Run(new FrmMain());
                        // }
                        //login  form1 = new login ();
                        //form1.Close();
                        //FrmMain  form2 = new FrmMain ();
                        //form2.Show();
                    }
                    else
                    {
                        MessageBox.Show("你的用户名或密码不正确,请重新输入!");
                        return;
                    }
                }
                //comboBox1.Items.Add(DT.Rows[i]["用户姓名"]);
            }
            //(new Main()).Show();
        }        public static string StringToMD5Hash(string inputString)
        {
            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
            byte[] encryptedBytes = md5.ComputeHash(Encoding.ASCII.GetBytes(inputString));
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < encryptedBytes.Length; i++)
            {
                sb.AppendFormat("{0:x2}", encryptedBytes[i]);
            }
            return sb.ToString();
        }
    }
}

Answer 1

楼主，你觉得登录信息存放到xml文件中安全吗?

Answer 2

jryu2k5能在上面代码上详细写一下吗

Answer 3

        private void Form1_Load(object sender, EventArgs e) 
        {             string strConn = "Data Source=fbonn;Initial Catalog=biiz_DB;Integrated Security=True"; 
            string sql = " select * from userinfo "; 
            sqlConnection1 = new SqlConnection(strConn); 
            sqlDataAdapter1 = new SqlDataAdapter(sql, sqlConnection1); 
            DS = new DataSet("UserName"); 
            sqlDataAdapter1.Fill(DS, "UserName");
            DS.WriteXml("test.xml"); 
            DT = DS.Tables["UserName"]; 
            for (int i = 0; i < DT.Rows.Count; i++) 
            { 
                // lblusername.Text.Add(DT.Rows[i]["UserName"]); 
                // lblusername.TabIndex = 0;//显示数据库的第一行数据 
            } 
        }