帮助看下winform中点击按钮备份数据库的问题，谢谢！
 private void button2_Click(object sender, EventArgs e)
        {
            try
            {
                if (this.folderBrowserDialog1.ShowDialog() == DialogResult.OK)
                {
                    string path = this.folderBrowserDialog1.SelectedPath;
                    string sql = string.Format("Backup database dbyizhi to disk = '{0}'", path+"\\"+"beifen"); 
                    //dbyizhi是mdb数据库名字，beifen是我打算给备份文件起的名字
                    OleDbConnection conn = new OleDbConnection(@"provider=Microsoft.ACE.OLEDB.12.0;
            Data Source=F:\lift_manage_design\lift_manage_design\dbyizhi.mdb;Initial Catalog=dbyizhi;User ID=sa;pwd=sa");
                    conn.Open();
                    OleDbCommand command = new OleDbCommand(sql, conn);
                    command.ExecuteNonQuery();
                    //下面判断文件是否生成来确定是否备份成功
                    //还原是一样的.只是sql改成"RESTORE FILELISTONLY  FROM DISK ='路径'"
                }
            }
            catch (Exception err)
                {
                    MessageBox.Show(err.Message);