api impersonation in c#

api.cs

[Authorize]
public class ValuesController : ApiController
{
      // GET api/values
      public IEnumerable<string> Get()
      {
          WindowsPrincipal wp = (WindowsPrincipal)Thread.CurrentPrincipal;
          WindowsIdentity wi = (WindowsIdentity)wp.Identity;
          WindowsImpersonationContext wc = wi.Impersonate();
          // this code accesses file system under 
          // the caller identity
          //wc.Undo();

          return new string[] { "value1", "value2" };
   }
 
 }

app.cs

public ActionResult Test()
{
    ViewBag.Message = "Your Message";
    var url = "http://localhost:52853/api/values";

    using (var client = new WebClient { UseDefaultCredentials = true })
    {
        var responseArray = client.DownloadString(url);
    }

    //var httpClient = new HttpClient();
    //var response = httpClient.GetStringAsync(new Uri(url));
    //var really = response.Result;
    //var releases = JArray.Parse(really);
    //httpClient.Dispose();

    return View();
}