public override void ExecuteResult(ControllerContext context)
{
var serializer = new XmlSerializer(model.GetType());
serializer.Serialize(context.HttpContext.Response.Output, model);
var expectedContentType = model.GetType().GetXmlRootNamespace();
if (context.HttpContext.Request.AcceptTypes == null || !context.HttpContext.Request.AcceptTypes.Contains(expectedContentType))
throw new UnsupportedContentTypeException(context.GetHeader("Accept"), expectedContentType);
context.HttpContext.Response.ContentType = expectedContentType;
}