How do I receive value(string) from WCF restful service into a ASP.NET web application

public string GetUser()
        {

            SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["dbcon"].ConnectionString);
            SqlCommand sqcmd = new SqlCommand("sp_showUser", conn);
            sqcmd.CommandType = CommandType.StoredProcedure;
            string al = null;
            try
            {
                conn.Open();
                SqlDataReader sdr = sqcmd.ExecuteReader();
                DataSet ds = new DataSet();
                ds.Tables.Add("Users");
                StringWriter sw = new StringWriter();
                ds.WriteXml(sw, XmlWriteMode.IgnoreSchema);
                al = sw.ToString();
            }
            catch (Exception er)
            {
                Console.WriteLine("Exception : {0}", er.Message);
                Console.Read();
            }
            finally
            { conn.Close(); }

            return al;
}

HttpClient client = new HttpClient();
            string response = client.GetAsync("http://localhost:61750/UserService.svc/GetUser").Result.ToString();
            //HttpContent strm = response.Content;
            //string data = strm.ReadAsStringAsync().ToString();
            DataSet dSUser = new DataSet();
            TextReader reader = new StringReader(response);
            dSUser.ReadXml(reader);
                GridView1.DataSource = dSUser;
                GridView1.DataBind();