public class CheckLoginedPage : System.Web.UI.Page
{

public CheckLoginedPage()
{
Load += CheckLogin;//構(gòu)造函數(shù)中加載CheckLogin方法
}

/// summary>
/// 判斷是否登錄
/// /summary>
/// param name="sender">/param>
/// param name="e">/param>
public void CheckLogin(object sender, EventArgs e)
{
if (Session["XXXX"] == null)//登錄時(shí)保存在Session的值
{
Response.Redirect("**.aspx");//如果為空，轉(zhuǎn)到要調(diào)轉(zhuǎn)的頁(yè)面
}
}

}