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   protected void Button3_Click(object sender, ImageClickEventArgs e)
    {
        if (FileUpload1.HasFile)
        {
            //ÖØÃüÃûͼƬ
            string strFileName1 = FileUpload1.FileName;            //È¡µ½ÉÏ´«ÎļþµÄÃû³Æ
            string[] myfile = strFileName1.Split('.');               //°ÑÎļþÃûÓëÎļþÀàÐÍ·Ö¿ª
            string dotname = myfile[myfile.Length - 1].ToString().ToLower();             //µÃµ½ÎļþÀàÐÍ
            if (dotname == "gif" || dotname == "jpg")
            {
                string filepath = Path.GetFullPath(FileUpload1.PostedFile.FileName);
                Random myrdn = new Random();                    //²úÉúËæ»úÊý
                strFileName1 = DateTime.Now.ToString("yyMMddHHmm") + myrdn.Next(10000).ToString() + "." + dotname;
                string imgpath = Server.MapPath("UserImg/");
                string folder = "b


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