ASP.NET 对FileUpLoad验证，上传图片到文件

(1) ASP.NET 的数据验证空件RegularExpressionValidator 实现验证FileUpLoad上传文件的类型
 <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="FileUpload1"
        ErrorMessage="格式不准确，只能(.jpg|.JPG|.gif|.GIF|.bmp|.BMP）"
        ValidationExpression="^([a-zA-Z]:\\)[0-9a-zA-Z\u4e00-\u9fa5\w\s\\!@#\$%^&\*\(\)_\+\-=\[\]{};'\,\.]*(.jpg|.JPG|.gif|.GIF|.bmp|.BMP)$"
></asp:RegularExpressionValidator>
（2）FileUpload添加照片到指定的文件里面
  string filename = FileUpload1.FileName;
        string savePath = Server.MapPath("../images/adverts/");
        string extension = Path.GetExtension(filename);
        string imageName = "";
        imageName = DateTime.Now.ToString("yyyyMMddhhmmss") + extension;
        savePath = savePath + imageName;
        FileUpload1.PostedFile.SaveAs(savePath);