解决方法
protected void Page_PreInit(object sender,EventArgs e)
{
Response.StatusCode = 301;
Response.StatusDescription = "Moved Permanently";
Response.RedirectLocation = "AnotherPage.aspx";
HttpContext.Current.ApplicationInstance.CompleteRequest();
}
在4.0中，有一个简单的HttpResponse.RedirectPermanent()方法可以为您做上述任务：
Response.RedirectPermanent("AnotherPage.aspx");
