Stucked in controller code logic in asp.net mvc4.

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C#

ASP.NET

MVC4

I have created a Repository class and functions are written there.Simply want to post a form and list but could not understand the error.Form is not being posted ,neither its being listed and shows error in AdminRepo.please show me the way.
AdminClientRepo.cs

namespace eValuation.Repo
{
    public class AdminClientRepo
    {
        Adm_ClientEntities db = new Adm_ClientEntities();

        public IEnumerable<ClientModel> GetClientlist()
        {
            var result = Mapper.Mapper.Map<ICollection<Client>, IList<ClientModel>>(db.Clients.ToList());
            return result;
        }

        public string AddProfile(ClientModel entity)
        {
            try
            {

                db.Clients.Add(Mapper.Mapper.Map<ClientModel, EDMXAdminClient.Client>(entity));
                db.SaveChanges();
                return "successs";
                
            }
            catch (Exception exp)
            {
                return exp.Message;
            }
                }
                       
    }
}

ClientController.cs

namespace eValuation.Controllers.Client
{

    public class ClientController : Controller
    {
        private Adm_ClientEntities db = new Adm_ClientEntities();

        //
        // GET: /Client/
        [HttpGet]
        public ActionResult ClientProfile()
        {
            return View();
        }

        [HttpPost]
        public ActionResult ClientProfile(ClientModel entity, FormCollection frmclc, int? IDClient)
        {

            if (ModelState.IsValid)
            {
                AdminClientRepo adm = new AdminClientRepo();
                {
                    var result = adm.AddProfile(entity);
                    return View();
                  //  return RedirectToAction("_List");
                                              
                }

                
            }
            ViewBag.Clients = new SelectList(db.Clients);
            return View(entity);

        }

        [AcceptVerbs(HttpVerbs.Get)]
        public ActionResult _List(IEnumerable<ClientModel> Clients)
        {
            AdminClientRepo adm = new AdminClientRepo();
            {
                var clt = adm.GetClientlist();
                 return View("_List", clt);
                                                      
            }
            
        }
    
    }
}

ClientProfile.cshtml

@model eValuation.Models.ClientModel

@{
    ViewBag.Title = "ClientProfile";
}

@using (Html.BeginForm())
{
    @Html.ValidationSummary(true)
    @Html.HiddenFor(model => model.IDClient)
           
       <table style="width:1000px"> 
        <tr>
            <td class="client-label-td" >
                <div class="client-label">@Html.LabelFor(model => model.Client_Name)</div>
              </td>
            <td>
                <div class ="client-field">@Html.TextBoxFor(m => m.Client_Name) 
                     @Html.ValidationMessageFor(model => model.Client_Name)
                </div><br />
            </td>
           </tr>

        <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.Client_Type)
            </div>
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.Client_Type)
                 @Html.ValidationMessageFor(model => model.Client_Type)
             </div><br />
            </td>
            </tr>

         <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.Reg_no)
            </div>
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.Reg_no)
                 @Html.ValidationMessageFor(model => model.Reg_no)
             </div><br />
            </td>
            </tr>

          <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.Pan_no)
            </div>
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.Pan_no)
                 @Html.ValidationMessageFor(model => model.Pan_no)
             </div> <br />
            </td>
            </tr>

          <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.Ctz_no)
            </div>
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.Ctz_no)
                 @Html.ValidationMessageFor(model => model.Ctz_no)
             </div> <br />
            </td>
            </tr>

     <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.Ctz_Issue_Date)
            </div>
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.Ctz_Issue_Date)
                 @Html.ValidationMessageFor(model => model.Ctz_Issue_Date)
             </div> <br />
            </td>
            </tr>

         <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.Address_Type)
            </div>
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.Address_Type)
                 @Html.ValidationMessageFor(model => model.Address_Type)
             </div> <br />
            </td>
            </tr>

         <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.Address_L1)
            </div>
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.Address_L1)
                 @Html.ValidationMessageFor(model => model.Address_L1)
             </div> <br />
            </td>
            </tr>
          <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.Address_L2)
            </div>
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.Address_L2)
                 @Html.ValidationMessageFor(model => model.Address_L1)
             </div> <br />
            </td>
            </tr>
          <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.Reg_Date)
            </div>
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.Reg_Date)
                 @Html.ValidationMessageFor(model => model.Reg_Date)
             </div> <br />
            </td>
            </tr>

         <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.Contact_Point)
            </div>
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.Contact_Point)
                 @Html.ValidationMessageFor(model => model.Contact_Point)
             </div> <br />
            </td>
            </tr>

        <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.Contact_No1)
            </div>
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.Contact_No1)
                 @Html.ValidationMessageFor(model => model.Contact_No1)
             </div> <br />
            </td>
            </tr>

        <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.Contact_No2)
            </div> <br />
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.Contact_No2)
                 @Html.ValidationMessageFor(model => model.Contact_No1)
             </div> <br />
            </td>
            </tr>

        
        <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.Email_Id)
            </div>
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.Email_Id)
                 @Html.ValidationMessageFor(model => model.Email_Id)
             </div> <br />
            </td>
            </tr>
         <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.IsActive)
            </div>
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.IsActive)
                 @Html.ValidationMessageFor(model => model.IsActive)
             </div> <br />
            </td>
            </tr>

           <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.Created_On)
            </div>
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.Created_On)
                 @Html.ValidationMessageFor(model => model.Created_On)
             </div>
                 <br />
            </td>
            </tr>

           <tr>
        <td class ="client-label-td">
            <div class="client-label">@Html.LabelFor(model => model.Updated_On)
            </div>
            </td>
             <td>
             <div class="client-field">@Html.TextBoxFor(model => model.Updated_On)
                 @Html.ValidationMessageFor(model => model.Updated_On)
             </div> <br /> <br />
                 <p>
                     <button type ="submit">Save value</button>
                      @Html.ActionLink("Back to List","_List")

                 </p>
                 
            </td>
            </tr>
        </table>         
       
     
}
   
@*<div>
    @Html.ActionLink("Back to List","_List")
</div>*@

@section Scripts {
    
    @Scripts.Render("~/bundles/jqueryval")
}

_List.cshtml

@*@model List<eValuation.Models.ClientModel>*@

@model ICollection<eValuation.Models.ClientModel>
@{
    ViewBag.Title = "List";
}


<div>
    <p>
        @Html.ActionLink("Add New Client","ClientProfile")
    </p>
    <table>
        <thead>
        <tr>
                <th style="width: 80px;"></th>
                <th style="width: 100px;">Client Name</th>
                <th style="width: 150px;">Is Active</th>
                <th style="width: 100px;">Created_On</th>
                <th style="width: 100px;">Updated_On</th>
        </tr>
        </thead>
        <tbody>
            @foreach (var item in Model)
            {
               <tr>
                   <td>
                    @Html.DisplayFor(modelitem =>item.Client_Name)
                   </td>
               </tr>
                
                <tr>
                   <td>
                              @Html.DisplayFor(modelitem =>item.IsActive)
                   </td>
               </tr>
                
                <tr>
                   <td>
                               @Html.DisplayFor(modelitem =>item.Created_On)
                   </td>
               </tr>
                
                <tr>
                   <td>
                                @Html.DisplayFor(modelitem =>item.Updated_On)
                   </td>
               </tr>
               }

                         
        </tbody>
    </table>
</div>