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Working with checkboxes in asp.net mvc3 plus mass update
@model List<LeagueCounters.Models.champion>
<form name="setFree id="setFree" method="POST" action="/Champion/SetFree">
    @foreach (var item in Model)
    {
        if (item.isFree == true)
        {
           <input type="checkbox" id="@item.id" checked="checked" /> @Html.DisplayFor(modelItem => item.displayName)
        }
        else
        {
            <input type="checkbox" id="@item.id" /> @Html.DisplayFor(modelItem => item.displayName)
        }
    }
<p><input type="submit" value="Save" /></p>

[HttpPost, Authorize(Roles = "Admin")]
public ActionResult SetFree(FormCollection fcMain)
{
     var sortedList = from c in _db.champions
                      orderby c.name
                      select c;
     int counter = 0;
     foreach (champion champ in sortedList)
     {
         if (fcMain[counter].Contains("true"))
            champ.isFree = true;
         else
            champ.isFree = false;

         _db.champions.Attach(champ);
         _db.ObjectStateManager.ChangeObjectState(champ, EntityState.Modified);

         counter++;
     }

     _db.SaveChanges();

     return View();
}

fcMain[counter].Contains("true")

<input type="hidden" value="false" id="@item.id" name="@item.id"/>

if (item.isFree == true)
{
   <input type="checkbox" id="@item.id"  checked="checked" /> @Html.DisplayFor(modelItem => item.displayName)
}
else
{
   <input type="checkbox" id="@item.id" /> @Html.DisplayFor(modelItem => item.displayName)
}

<input type="checkbox" id="@item.id" name="@item.id" @(!Item.isFree?"checked="checked":""") /> @Html.DisplayFor(modelItem => item.displayName)

_db.champions.Attach(champ);
_db.ObjectStateManager.ChangeObjectState(champ, EntityState.Modified);