Create xml file from string and downloading it with save dialog

I needed to create an XML programmatically and then to send it to the user to download. For this purpose I created a Page that is called from a customAction. Here is the code for the xml downloading part.

Aspx:

<%@ Assembly Name="$SharePoint.Project.AssemblyFullName$" %>

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ExportApplication.aspx.cs" Inherits="ListItemExport.Layouts.ListItemExport.ExportApplication" Debug="true" %>

Code Behind:

namespace ListItemExport.Layouts.ListItemExport

{

    public partial class ExportApplication : System.Web.UI.Page

    {

        protected override void OnLoad(EventArgs e){

            base.OnLoad(e);

            String xmlString = "<xml><test>testvalue</test></xml>";

            String listId = Request.Params["listId"];

            String itemId = Request.Params["itemId"];

            XmlDocument xDoc = new XmlDocument();

            xDoc.LoadXml(xmlString);

            MemoryStream xmlStream = new MemoryStream();

            xDoc.Save(xmlStream);

            Response.Clear();

            Response.AppendHeader("Content-Disposition","attachment; filename=test.xml");

            Response.ContentType = "text/XML";

            Response.BinaryWrite(xmlStream.ToArray());

        }

    }

}