private string RouteExistingRegistration(OnlineRegModel m, int? pid = null)
{
var existingRegistration = m.GetExistingRegistration(pid ?? Util.UserPeopleId ?? 0);
if (existingRegistration == null)
return null;
m.Log("Existing");
TempData["PeopleId"] = existingRegistration.UserPeopleId;
return "/OnlineReg/Existing/" + existingRegistration.DatumId;
}