handelling post with web api

post.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using System.Net.Http.Headers;

namespace testwebapp.Controllers
{
    public class OMSInput {
        public string severity = String.Empty;
        public string description = String.Empty;
    };

    public class ValuesController : ApiController
    {
        // GET api/values
        public IEnumerable<string> Get()
        {
            return new string[] { "value1", "value2" };
        }

        // GET api/values/5
        public string Get(int id)
        {
            return "value";
        }

        // POST api/values
        [HttpPost]
        public HttpResponseMessage Post([FromBody]OMSInput value)
        {
            var resp = new HttpResponseMessage()
            {
                Content = new StringContent("{\"ack\":\"true\"}")
            };
            resp.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
            return resp;
        }

        // PUT api/values/5
        public void Put(int id, [FromBody]string value)
        {
        }

        // DELETE api/values/5
        public void Delete(int id)
        {
        }
    }
}