退出登录，清除Session

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 protected void Button1_Click(object sender, EventArgs e)
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    {
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        if (Session["UserName"] != null)
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        {
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            Session.Remove("UserName");
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            Session.RemoveAll();
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            Response.Cookies["UserName"].Expires = DateTime.Now;
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        }
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        Page.RegisterStartupScript("","<script>window.top.document.location.href='index.aspx';</script>");
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    }