本文介绍了一个ASP.NET页面加载事件中如何判断页面是否为初次加载还是回发加载，通过IsPostBack属性来区分并执行相应的操作。
Gets a value that indicates whether the page is being rendered for the first time or is being loaded in response to a postback.
private void Page_Load()
{
if (!IsPostBack)
{
// Validate initially to force asterisks第一次加载
// to appear before the first roundtrip.
Validate();
}
}
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