Çözüm Write Metodundan sonra Response.End() metodunu çağırmaktır.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml;
public partial class xmlData : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Response.ContentType = "text/xml";
String xml = "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>"+
"<note>"+
"<to>Ahmet</to>"+
"<from>Mustafa</from>"+
"<heading>Hatırlatıcı</heading>"+
"<body>Hafta Sonunu Unutma</body>"+
"</note>";
Response.Write(xml);
}
}