C# - Render Response Stream With Jquery?

MemoryStream export = new MemoryStream();
iCalendarSerializer serializer = new iCalendarSerializer(iCal);
serializer.Serialize(export,System.Text.Encoding.UTF8);
return export;

so I am using the C# DDay.iCal library for exporting my calendars. Serialize takes in a "stream" so I passed it a memory stream. I now have a generic handler that calls the method that contains the above code.

public class CalendarHandler : IHttpHandler
{
private Calendar service;
private Membership membershipS;
public void ProcessRequest(HttpContext context)
{
service = new Calendar ();
membershipS = new Membership (null);
string userName = context.User.Identity.Name;
Guid userId = membershipS.GetUsersId(userName);
context.Response.ContentType = "text/calendar";
// calls the export calendar(the code that showed above that uses dDay ical.
var t = service.ExportCalendar(userId);
t.WriteTo(context.Response.OutputStream);
}
public bool IsReusable
{
get
{
return false;
}
}
}

So now I wrote the icalendar to the Outputstream. Now I have a jquery post that goes to this method and now I am not sure how to take the OutputStream result that the jquery post will get and make it popup with a save dialog box.

$('#ExportCalendar').click(function(e)
{
$.post('../Models/CalendarHandler.ashx', null, function(r)
{
});
return false;
});