public JsonResult GetValues(List<string> codes)

 using (var wb = new System.Net.WebClient())
            {
                URL += "Global/GetValues?"Codes=" + ((Codes == null) ? "" : Newtonsoft.Json.JsonConvert.SerializeObject(Codes));
                log.Info(URL);
                var response = wb.DownloadString(URL);
                dynamic res = Newtonsoft.Json.JsonConvert.DeserializeObject(response);

 using (var wb = new System.Net.WebClient())
            {
                URL += "Global/GetValues?"Codes=" + ((Codes == null) ? "" : Newtonsoft.Json.JsonConvert.SerializeObject(Codes));
                log.Info(URL);
                var response = wb.DownloadString(URL);
                dynamic res = Newtonsoft.Json.JsonConvert.DeserializeObject(response);

using (var wb = new System.Net.WebClient())
            {
                URL += "Global/GetValues";

                wb.QueryString.Add("codes", ((codes== null) ? "" : Newtonsoft.Json.JsonConvert.SerializeObject(codes)));

                var responseBytes = wb.UploadValues(URL, "POST", wb.QueryString);

["CODE1","CODE2"]

public JsonResult GetValues(List<string> codes)

                    String URL = "http://localhost:3890/Apps/MyTest";
                    List<String> values = new List<string>();
                    values.Add("code1");
                    values.Add("code2");
                    
                    HttpClient client = new HttpClient();
                    var pairs = new List<KeyValuePair<string, string>>
                    {
                        new KeyValuePair<string, string>("values", Newtonsoft.Json.JsonConvert.SerializeObject(values))
                    };

                    var content = new FormUrlEncodedContent(pairs);

                    var response = client.PostAsync(URL, content).Result;

                    if (response.IsSuccessStatusCode)
                    {


                    }

        [System.Web.Http.AcceptVerbs("GET","POST")]
        [System.Web.Http.HttpGet]
        public ResponceObject MyTest(IEnumerable<String> values)
        {
            if (values == null)
                return null;
            String ret = "";
            foreach (String value in values)
                ret += value + " DELIMITER ";

            return new ResponceObject("No Error", ret);
        }

        public ResponceObject MyTest(List<String> values)
        {
            if (values == null)
                return null;
            String ret = "";
            foreach (String value in values)
                ret += value + " DELIMITER ";

            return new ResponceObject("No Error", ret);
        }

        [HttpGet]
        public ResponceObject MyTest()
        {
            
            ResponceObject ret = new ResponceObject();
            try
            {
                using (var wb = new System.Net.WebClient())
                {
                    String URL = "http://localhost:24130/api/Values";
                    List<String> values = new List<string>();
                    values.Add("code1");
                    values.Add("code2");


                    WebClient wc = new WebClient();

                    wc.QueryString.Add("values", Newtonsoft.Json.JsonConvert.SerializeObject(values));

                    var data = wc.UploadValues(URL, "POST", wc.QueryString);

                    // data here is optional, in case we recieve any string data back from the POST request.
                    var responseString = UnicodeEncoding.UTF8.GetString(data);

                    
                }
            }
            catch (Exception e)
            {
                ret.Error = e.Message;
                
            }
            return ret;
        }

                    HttpClient client = new HttpClient();
                    var pairs = new List<KeyValuePair<string, string>>
                    {
                        new KeyValuePair<string, string>("values", "value1"),
                        new KeyValuePair<string, string>("values", "value2")
                    };

                    var content = new FormUrlEncodedContent(pairs);

                    var response = client.PostAsync(URL, content).Result;

                    if (response.IsSuccessStatusCode)
                    {


                    }

        
[System.Web.Http.HttpGet]
public ResponceObject MyTest(IEnumerable<String> values)

                var client = new HttpClient();
                var values = new List<string> { "code1", "code2" };
                var url = "http://localhost:24130/api/Values?MyTest";

                HttpResponseMessage response = client.PostAsJsonAsync(url, values).Result;
                var content = response.Content.ReadAsAsync<ResponceObject>().Result;

HttpResponseMessage response = client.PostAsJsonAsync(url, values).Result;

namespace CallerPrj.Controllers
{
    public class ValuesController : ApiController
    {

        [HttpGet]
        public ResponceObject MyTest()
        {
            ResponceObject ret = new ResponceObject();
            try
            {
                var client = new HttpClient();
                var values = new List<string> { "code1", "code2" };
                var url = "http://localhost:24130/api/Values?MyTest";

                HttpResponseMessage response = client.PostAsJsonAsync(url, values).Result;
                var content = response.Content.ReadAsAsync<ResponceObject>().Result;

                ret.Value = content.Value;
                ret.Error = content.Error;
            }
            catch (Exception e)
            {
                ret.Error = e.Message;
            }
            return ret;
        }
    }
}

namespace CalledPrj.Controllers
{
    public class ValuesController : ApiController
    {
        [HttpPost]
        public ResponceObject MyTest(List<String> values)
        {
            if (values == null)
                return null;
            String ret = "";
            foreach (String value in values)
                ret += value + " DELIMITER ";

            return new ResponceObject("No Error", ret);
        }

    }
}

public JsonResult GetValues(String companyId, Long userId, List<string> codes)