How to get value from javascript code and pass it to C# code to test it

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C#

Javascript

Greeting All ,
I have a problem to retreive a value from javascript code , I need this value to test it on my c# code .
I have two checkboxes :

<ul id="childCheckBox">
     <a id ="page" href="#"><input id="onPage" type="checkbox" class="childCheckBox" value="#" />@ApplicationResources.PostOnPage</a>
     <a id ="mur" href="#"><input id="onWall" type="checkbox" class="childCheckBox" value="#"/>@ApplicationResources.PostOnWall</a>
  </ul>
  </div>

If the first is checked a function will be executed and if the second will be checked then an other function will be executed .
How can I test which one is checked
Here id my C# code :

var joboffer = manager.JobOffer.GetJobOfferById(id);

if (Test)

    FBEngine.PostJob(joboffer);
}
else
{
    FBEngine.PostJobOnWall(joboffer);
}

I need Help please !
Thanks in advance