using System;

using System.Threading;

using System.Threading.Tasks;   

​

namespace SomeNamespace

{

    public static async Task<JObject> GetJsonAsync(Uri uri)

    {

      using (var client = new HttpClient())

      {

        var jsonString = await client.GetStringAsync(uri);

        return JObject.Parse(jsonString);

      }

    }

​

    public class MyController : ApiController

    {

      public string Get()

      {

        var jsonTask = GetJsonAsync(...);

        return jsonTask.Result.ToString();

      }

    }

}