ASP - Can't import Mail library

programming
1

So I’m making the switch from PHP and going right back to basics with ASP.NET (C#). I have a suitably hefty text book, but I’m failing at the first example.


<%@ Page Language="C#" %>
<%@ Import Namespace="System.Net.Mail" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
    void Page_Load() {
        SmtpClient client = new SmtpClient();
        client.Host = "localhost";
        client.Port = 25;
        client.Send("noone@nothing.co.uk", "himself@duncanhall.net", "Email Subject", "This is a message"); 
    }
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Send Mail</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        Email sent!
    </div>
    </form>
</body>
</html>

Simply trying to send an email, but I get a compilation error with:

[FONT=Arial, Helvetica, Geneva, SunSans-Regular, sans-serif]*The type or namespace name ‘Mail’ does not exist in the class or namespace ‘System.Net’ (are you missing an assembly reference?)

*Any ideas? This seems so trivial.
[/FONT]