C#图形界面form中添加botton,点击botton按钮，则浏览器进入www.baidu.com主页面。代码怎么写？

private void btnWWW_Click(object sender, EventArgs e)
        {
            Process.Start("IExplore.exe", " http://www.baidu.com/");


        }

System.Diagnostics.Process.Start("iexplore.exe","www.baidu.com");