Get the checked value in the controller

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C#

HTML

This my html code :

using (Html.BeginForm("SuccessFacebookPost", "JobOffer"))
{
   <div class="hiddenF">
   <ul id="childCheckBox">
        <a id ="page" href="#"><input id="OnPage" type="checkbox" class="childCheckBox" name="BoxChecked" value="OnPage" />@ApplicationResources.PostOnPage</a>
        <a id ="mur" href="#"><input id="OnWall" type="checkbox" class="childCheckBox" name="BoxChecked" value="OnWall" />@ApplicationResources.PostOnWall</a>
   </ul>
   </div>
}

This is my controller code :

public ActionResult SuccessFacebookPost(string[] BoxChecked)
{

   var ids = (IEnumerable<int>)Session["ids"];
   foreach (var id in ids)
   {
      var fbConfig = manager.SocialNetworkConfigManager.GetSocialNetworkConfigByName("Facebook");
      var credentials = new FacebookCredentials
         {
            ApiKey = fbConfig.ApiKey,
            ApiSecret = fbConfig.ApiSecret,
            CallbackUrl = fbConfig.CallbackUrl,
            AccountId = fbConfig.AccountId
         };
      FacebookEngine FBEngine = new FacebookEngine(credentials);
      var joboffer = manager.JobOffer.GetJobOfferById(id);
      if (BoxChecked[0] == "OnPage")
      {
         FBEngine.PostJob(joboffer);
      }
      if (BoxChecked[1] == "OnWall")
      {
         FBEngine.PostJobOnWall(joboffer);
      }
   }
}

BoxChecked is always null , I don't understand where is exactely the error .
All what I want is just to test the value of the checked box and execute the corresponding function .
Any help please