[求助]HtmlInputFile未实例的问题

Question

缺了runat="server"<INPUT id="fileup1" style="Z-INDEX: 106; LEFT: 88px; WIDTH: 376px; POSITION: absolute; TOP: 272px; HEIGHT: 22px; Design_Time_Lock: True"
type="file" size="43" name="fileup1" Design_Time_Lock="True" runat="server">

Answer 1

&lt;  <
&gt;  >
&amp;  &
&apos;  '
&quot;  "
&nbsp;  White Space

Answer 2

是不是string aa=aa.Replace(">","&lt");可是文本框里是：＜dddd＞提交时系统会先测到有＜＞号会提示：从客户端(SUBJECT="<dddd>")中检测到有潜在危险的 Request.Form 值然后才进入转化怎么解决？？