Web api insert failed but code seems fine. What could be wrong?

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ASP.NET

WebAPI

hi
Sorry i posted this in the discussion which i think is a wrong place and i repost here.

I do not know where is going wrong but i seems not able to insert data using web api. Any help greatly appreciated and thanks a lot

The data

{"ID":1,"EmailAddress":"demo@demo.com"}

and the code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using Dapper;
using System.Threading.Tasks;
using Newtonsoft.Json.Linq;

namespace cirqer.Controllers.api
{

    public class EmailListList
    { 
        public int ID { get; set; }
        public string EmailAddress { get; set; }
    }

    public class emaillistController : ApiController
    {
        static string connectionstring = ConfigurationManager.ConnectionStrings["CRConnectionString"].ConnectionString;

        [HttpGet]
        public Int16 EmailList_SelectCount()
        {
            try
            {
                using (var conn = new SqlConnection(connectionstring))
                {
                    Int16 x = conn.ExecuteScalar("EmailList_SelectCount", commandType: CommandType.StoredProcedure);
                    return x;
                }
            }
            catch
            {
                return 0;
            }
        }

        [HttpPost]
        public void EmailList_Insert(EmailListList email)
        {
            try
            {
                // dynamic data = email; 
                using (var conn = new SqlConnection(connectionstring))
                {
                    conn.Open();
                    conn.Execute("EmailList_Insert", email, commandType: CommandType.StoredProcedure);
                    conn.Close();
                }
            }
            catch
            {
            }
        }

What I have tried:

Using telerik fiddler to simulate insert but failed.