C#数据库的备份(SQL2005)

[csharp]
using System;
[csharp]
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.IO;
namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            this.txtName.Text = "数据库名" + System.DateTime.Now.ToShortDateString();
        }
        //将数据库备份到应用程序的跟目录下
        string connectionString = "server=服务器名;database=数据库名;uid=用户名;pwd=密码";

        private void btn_beifen_Click(object sender, EventArgs e)
        {
            try
            {
                string strg = Application.StartupPath.ToString();
                strg = strg.Substring(0, strg.LastIndexOf("\\"));
                strg = strg.Substring(0, strg.LastIndexOf("\\"));
                strg += @"\Data";
                string sqltxt = @"BACKUP DATABASE 数据库名 TO Disk='" + strg + "\\" + txtPath.Text + ".bak" + "'";
                SqlConnection con = new SqlConnection(connectionString);
                con.Open();
                SqlCommand cmd = new SqlCommand(sqltxt, con);
                cmd.ExecuteNonQuery();
                con.Close();
                if (MessageBox.Show("备份成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation) == DialogResult.OK)
                {
                    this.Close();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message.ToString());
            }
        }
        //选择保存目录事件
        private void btn_open_Click(object sender, EventArgs e)
        {
            folderBrowserDialog1.Description = "请选择备份文件将要保存到的文件夹，如有必要你可以\n通过单击左下角的‘新建文件夹’按钮新建文件夹";
            if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
            {
                txtPath.Text = folderBrowserDialog1.SelectedPath.ToString();
            }
        }
        //开始备份数据到指定目录下的指定文件名
        private void btn_ok_Click(object sender, EventArgs e)
        {
            string filepath="D:\\机房设备资源管理系统数据库备份\\";
            try
            {
                if (txtName.Text != "")
                {
                    if (txtPath.Text != "")
                    {
                         filepath=txtPath.Text.Trim()+"\\";
                    }else
                    {
                        if (MessageBox.Show("你确定要要将数据备份到默认位置：" + filepath + "下吗？", "信息提示", MessageBoxButtons.YesNo, MessageBoxIcon.Information) == DialogResult.No)
                        {
                            MessageBox.Show("请选择保存位置！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                            btn_open_Click(sender,

补充：软件开发 , C# ,