TempData["ChildObjectId"] = SelectedID;
return Redirect(MasterObjectControllerCreationURL);

if (TempData.ContainsKey("ChildObjectId"))
{
  ViewData["ChildObject"] = _context.ChildObject.Include(x => x.SubObject).Where(x => x.ChildObjectId == Convert.ToInt32(TempData["ChildObjectId"])).FirstOrDefault();
TempData.Remove("ChildObjectId");
}

if (ViewData.ContainsKey("ChildObject"))
  {
    Set field variables for the fields we want.
  }