public ActionResult FollowProduct(Follow vm)
{
if (followService.isExistFollow(vm.ProductId, vm.UserId) == false)
{
vm.IsChecked = true;
followService.AddFollow(vm);
}
else
{
var model = followService.FindFollow(vm.ProductId, vm.UserId);
followService.DeleteFollow(model);
}
return(RedirectToAction("Index", "Home"));
}