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    {
     //±£´æµÇ¼µÄÓû§Ãû
     Session["LoginUser"] = FormatString.Replace(txtLoginUser.Text);  //ÕâÀï¾ÍÊǸøsession¸³ÖµÁË.ÎҶԵǼÓû§½øÐÐÁËһЩ°²È«´¦Àí
     //תµ½¹ÜÀíÊ×Ò³
     Response.Redirect("Admin_Index.Aspx");
    }
    else
    {
     lblErr.Text = Message.Show("Óû§Ãû»òÃÜÂë´íÎó!");
     ShowValidate(); //ÖØÐÂÏÔʾÑéÖ¤Âë
    }
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        if(Session["LoginUser"] == null)  //ÉÏÃæSessionÃû×ÖÓÃLoginUser,ÕâÀïµÄÃû×ÖÒªºÍÉÏÃæµÄÏàͬ,¿ÉÒÔËæ±ã¸Ä,±£³ÖÒ»Ö¾ÍÐÐÁË,×¢Òâ:Session["LoginUser"]ºóÃæ,ûÓÐToString()Ŷ,ÄãÒªÊǼÓÉϵϰ,¾Í»á³ö´íÁË.
        {
                Response.Redirect("Login.Aspx"); //Èç¹ûSessionΪ¿Õ,Ôòתµ½µÇ½ҳ.
        }
        SessionÓпÉÄܻᶪʧµÄ,½â¾ö°ì·¨²Î¼ûÎÒдµÄÁíÒ»ÎÄÕÂ:
        SessionµÇ½ºó¶ªÊ§µÄ½â¾ö°ì·¨
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imgUrl2="uploads/"+ImgSrc[1];
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