Source code displays on page

Hello,
This is probably something pretty easy to fix, I just can't think of it and need some suggestions. I have an aspx page that displays with no problems in my internet browser(ie). I shipped a copy of this page to someone else, when they open up the page the source code can be viewed on the page. The offending source code is part of a text area in a form. The other browser does not seem to read the "<%" tags. Any suggestions to get this code to work properly?
Thanks in advance,
Cam

Offending code:
<form action="dave1.aspx" method="get">
Start Date
<INPUT value= "
<%if ((Request.QueryString["start_date"]!="") && (Request.QueryString["start_date"]!=null)) {
Response.Write(Request.QueryString["start_date"]);
}else {
Response.Write("");
}%> "
maxLength="10" size="6" name="start_date" onkeypress="window.focus()" onmouseover="window.focus()"
onclick="window.focus()">
<input name="submit" type="submit" value="Submit">
</form>

I figured it out. Although I had the dotnet framework installed I did not have asp.net 1.1 running.

Could you kindly elaborate? I am having the same problem when my application was deployed on a new machine. I never started or stopped anything to have ASP.NET running, and I don't see anything under 'services' other than 'ASP.NET State Service', which is an optional thing.