How to delete a record in Asp.Net Mvc using WebApi?

Question

I am performing asp.net mvc entity framework with webapi and when I m deleting a record but get an error.

Index.cshtml

@Html.ActionLink("Delete", "DPatymaster", new { PartyMstId = item.PartyMstId }) //when click delete button

PartyMstsController (Webapi project) 

namespace PartyCrops.Controllers
{
    public class PartyMstsController : ApiController
    {
        private POLISHSTOCK_SJDMSEntities db = new POLISHSTOCK_SJDMSEntities();

        [ResponseType(typeof(PartyMst))]
        public IHttpActionResult DeletePartyMst(PartyMst partyMst)
        {
            db.PartyMsts.Find (partyMst.PartyMstId);  //when I Debugging this line generate an error Object referance not set to an object
            if (partyMst == null)
            {
                return NotFound();
            }

            db.PartyMsts.Remove(partyMst);
            db.SaveChanges();

            return Ok(partyMst);
        }

PartyMstsController (normal project)

namespace WebParty.Controllers
{
    public class PartyMstsController : Controller
    {
        POLISHSTOCK_SJDMSEntities poly = new POLISHSTOCK_SJDMSEntities();

         public ActionResult dPatymaster(int PartyMstId)
         {
            var partymst = poly.PartyMsts.Find(PartyMstId);

            partymstmodel partymstupdate = new partymstmodel();

            partymstupdate.PartyCode = partymst.PartyCode;
            partymstupdate.PartyName = partymst.PartyName;

            return View(partymstupdate);
        }

        [HttpPost]
        public JsonResult DPatymaster(partymstmodel partymst, int PartyMstId)
        {
            var partymstupdate = poly.PartyMsts.Find(PartyMstId);

            partymstupdate.PartyCode = partymst.PartyCode;
            partymstupdate.PartyName = partymst.PartyName;


            HttpResponseMessage response = staticvariable.client.DeleteAsync("PartyMsts").Result; //When I m Debugging then Debugger come to this method DeletePartyMst(Api Project)  db.PartyMsts.Find (partyMst.PartyMstId); (here get an error object referance not set to an object)
            return Json("your record delete", JsonRequestBehavior.AllowGet);
        }

PartyMst.cs

//
//     This code was generated from a template.
//
//     Manual changes to this file may cause unexpected behavior in your application.
//     Manual changes to this file will be overwritten if the code is regenerated.
//
//------------------------------------------------------------------------------

namespace PartyCrops.Models
{
    using System;
    using System.Collections.Generic;

    public partial class PartyMst
    {
        public int PartyMstId { get; set; }
        public Nullable<int> PartyCode { get; set; }
        public string PartyName { get; set; }

static variable:

public static class staticvariable
    {
        public static HttpClient client = new HttpClient();

        static staticvariable()
        {
            client.BaseAddress = new Uri("http://localhost:27099/api/");
            client.DefaultRequestHeaders.Clear();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        }
    }

Model1.context.cs

</auto-generated>
<auto-generated>
namespace PartyCrops.Models
{
    using System;
    using System.Data.Entity;
    using System.Data.Entity.Infrastructure;

    public partial class POLISHSTOCK_SJDMSEntities : DbContext
    {
        public POLISHSTOCK_SJDMSEntities()
            : base("name=POLISHSTOCK_SJDMSEntities")
        {
        }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            throw new UnintentionalCodeFirstException();
        }

         public virtual DbSet<PartyMst> PartyMsts { get; set; }

when I m debugging in watch windows

Name value

PartyMstId 4 partymstcontroller.cs (mvc project)

partyMst null partymstcontroller.cs (webapi project)

db.PartyMsts.Find (partyMst.PartyMstId); here give an null value ? 

 partyMst model null when entering the contoller action

 

public int PartyMstId { get; set; } //when dubugger come here then 0  

namespace WebParty.Models
{
   public class partymstmodel
   {
      public int PartyMstId { get; set; }   //0 0

 plz help???