InfoPath library throws NotImplementedException for XmlFormView.XmlForm.SaveAs method
<InfoPath:XmlFormView ID="infoPathFormView" ShowHeader="false" Style="width: 100%;" runat="server" />

infoPathFormView.SaveLocation = "http://localhost/MyFormLibrary";
infoPathFormView.DataBind();

if(infoPathFormView.XmlForm.New)
{
   string fileName = Page.User.Identity.Name;
   infoPathFormView.XmlForm.SaveAs(fileName); // This line throws.
}
else
{
   infoPathFormView.XmlForm.Save();
}