using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Threading;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click1(object sender, EventArgs e)
{
System.Threading.Thread.Sleep(3000);
Label1.Text = "刷新时间：" + DateTime.Now.ToString();
}
protected void Button2_Click1(object sender, EventArgs e)
{
System.Threading.Thread.Sleep(3000);
Label2.Text = "刷新时间：" + DateTime.Now.ToString();
}
}
其中，页面代码中的css是msdn上的例子。UpdatePanel1中的UpdateProgress1显示一张动态gif图片
还往大哥大姐们多多指教。
