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

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

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

plz help???

can u explain in more details because still my record is not deleted I put the debug everywhere??

I think here something missing in my programme:

//I put the debugger here and when come debugger here then give an error object referance not set to an object??

partyMst = db.PartyMsts.Find(partyMst.PartyMstId);

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