Using web api how to work with controller

Question

I am using following code. let me know any other way

public async Task<ActionResult> Index()
{
string userName = System.Security.Principal.WindowsIdentity.GetCurrent().Name;
string qName = userName.Replace("AMAT\\", "");
string apiUrl = "http://dca-dev-577/deepika.ldap/api/AD/seachADUsers?searchText="+qName;

using (HttpClient client = new HttpClient())
{
client.BaseAddress = new Uri(apiUrl);
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));

HttpResponseMessage response = await client.GetAsync(apiUrl);
if (response.IsSuccessStatusCode)
{
var data = await response.Content.ReadAsStringAsync();
var table = Newtonsoft.Json.JsonConvert.DeserializeObject<System.Data.DataTable>(data);

JArray rss = JArray.Parse(data);
//JObject rss = JObject.Parse(data);
string FName = rss[0]["FirstName"].ToString();
string LName = rss[0]["LastName"].ToString();
ViewBag.message = "First Name: " + FName + " Last Name: " + LName;
}
}
return View();
}