Asp.net HttpClient GET Method call API

public string getResponse()

        {

            string response= String.Empty;

            using (var client = new HttpClient())

            {

                client.BaseAddress = new Uri(BASE_URL);

                var result = client.GetAsync(API_URL).Result;

                response= result.Content.ReadAsStringAsync().Result;

            }

            return response;

        }

here BASE_URL is some thing like www.mastermoin.com

and API_URL is looking like /api/helloservice