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 protected void Button1_Click(object sender, EventArgs e)
    {
      
        string fullName = this.File1.PostedFile.FileName;//»ñÈ¡ÉÏ´«ÎļþµÄȫ·¾¶
        string size = this.File1.PostedFile.ContentLength.ToString();//»ñÈ¡ÎļþÉÏ´«µÄ´óС
        string fileName = fullName.Substring(fullName.LastIndexOf("\\")+1);   //»ñÈ¡ÉÏ´«ÎļþµÄÎļþÃû
        string type = fullName.Substring(fullName.LastIndexOf(".")+1);//»ñÈ¡ÎļþÉÏ´«¸ñʽ
        if (type == "jpg" || type == "bmp" || type == "gif" || type == "ico")
        {
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            this.Imp.Visible = true;
            this.Imp.ImageUrl = "upload/" + fileName;//ÏÔʾͼƬ
        }
        else
        {
            Response.Write("<script language='javascript'>alert('ÄãÉÏ´«µÄͼƬ¸ñʽÓдíÎó£¡')</script>");
        }
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