In my controller this code:

```
[HttpPost]
        public ActionResult Edit(Company company, FormCollection IsCostCenters)
        {
            if (ModelState.IsValid)
            {
                Company objNewCompany = new Company();
                //oParty.CostCenters.Clear();

                using (PaymentAdviceEntityContainer db1 = new PaymentAdviceEntityContainer())
                {
                    objNewCompany = db1.Companies.Find(company.Id);

                    objNewCompany.CostCenters.Clear();

                    string[] temp = IsCostCenters["CostCenters"].Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
                    foreach (var s in temp)
                    {
                        if (s != "false")
                        {

                            CostCenter oCostCenter = new CostCenter();
                            oCostCenter = db1.CostCenters.Find(Convert.ToInt32(s));
                            objNewCompany.CostCenters.Add(oCostCenter);
                        }
                    }
                    db1.SaveChanges();
                }

                db.Entry(company).State = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
            }
            ViewBag.CreatedById = new SelectList(db.Employees, "Id", "FirstName", company.CreatedById);
            return View(company);
        }

```

And my view code as below

```
@using PaymentAdviceEntity;
@{

    ViewBag.Title = "Edit";
    List<CostCenter> clist = new List<CostCenter>();
    clist = ((List<CostCenter>)ViewBag.CostCenters).ToList();
}

                       <div style="line-height: 22px; width: 100%;height :3%; float: left; ">
                       @{
    foreach (var item in clist)
    {                      
                             <div  style="line-height: 22px; width: 28%; float: left;">
                                                <span class="checkbox">@Html.CheckBox("CostCenters", item.IsChecked, new { @value = item.Id })</span>
                                               <span>@Html.DisplayFor(modelItem => item.Name)</span>

                              </div> 

    }
}

```

So please what is reason `ModelState.IsValid` is return false in page post time ...