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protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        ViewState["BackUrl"] = Request.UrlReferrer.ToString();
    }
}
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/// ·µ»Ø°´Å¥µã»÷ʼþ
/// </summary>
protected void Button1_Click(object sender, EventArgs e)
{
    Response.Redirect(ViewState["BackUrl"].ToString());
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using System.Web;
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