xmlwriter not recognised

I'm looking at an example use of the xmlwriter in .net 2.0.
When I compile the code shown, I get errors like

The type or namespace name 'XmlWriterSettings' could not be found (are you missing a using directive or an assembly reference?)      

Why is this happening please? Do I need to add a reference to the project?

<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.Web;
public class Handler : IHttpHandler {
    public void ProcessRequest(HttpContext context)
        XmlWriterSettings settings = new XmlWriterSettings();
        settings.Indent = true;
        context.Response.ContentType = "text/xml";
        using (XmlWriter writer = XmlWriter.Create(context.Response.OutputStream, settings))
            writer.WriteAttributeString("imageUrl", "foo.jpg");
            writer.WriteAttributeString("thumbnailUrl", "foo_thumb.jpg");
            writer.WriteAttributeString("caption", "this is a test");
    public bool IsReusable {
        get {
            return false;

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peterdunganAuthor Commented:
It works after adding using system.xml to the references.


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Jaime OlivaresSoftware ArchitectCommented:
You will need:

using System.Xml;

at the beginning of your source code file, and also check the project References, as peter stated.
Jaime OlivaresSoftware ArchitectCommented:
to be more specific, go to Menu -> Project -> Add Reference... -> .net tab
Check if System.Xml.dll reference is checked.
peterdunganAuthor Commented:
Yes thanks I realised that and posted the reply above.
Jaime OlivaresSoftware ArchitectCommented:
sorry, not noticed, that you was the question's author.
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