WCF Service Connection Failure In Xamarin Android

Question

I have created an WCF Service and hosted it on Server.

This application having simple functionality like Get record from a SQL Server database.

Now I am executing this WCF Service on button click event in Xamarin Android of MainActivity.cs

But this is not working. Give me some solution. If I run the same service code in Normal C# application then it is working fine.

Bellow is my code.

public class MainActivity : Activity
    {
        TextView myLabel;
        EditText txtUserName;
        Button myButton;
        HttpClient Client;
        private string URIString;

        protected override void OnCreate(Bundle bundle)
        {
            Microsoft.WindowsAzure.MobileServices.CurrentPlatform.Init();
            base.OnCreate(bundle);
            SetContentView(Resource.Layout.Main);
            myLabel = FindViewById<TextView>(Resource.Id.myLabel);
            txtUserName = FindViewById<EditText>(Resource.Id.txtUserName);
            myButton = FindViewById<Button>(Resource.Id.myButton);
            myButton.Click += myButton_Click;
        }

        void myButton_Click(object sender, EventArgs e)
        {
            var textview = FindViewById<TextView>(Resource.Id.textView3);
            var s = GetData();
            var finalResult = s;
            textview.Text = finalResult.ToString();
        }
        public string GetData()
        {
            try
            {
                var request = HttpWebRequest.Create("http://xxxxx:2498/MyRestService.svc/GetEmployee/1");
                request.ContentType = "application/json";
                request.Method = "GET";
                using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
                {
                    using (StreamReader reader = new StreamReader(response.GetResponseStream()))
                    {
                        var content = reader.ReadToEnd();
                        var cleanValue = System.Text.RegularExpressions.Regex.Replace(content, @"[^a-zA-Z0-9]", "");
                        return cleanValue.ToString();
                    }
                }
            }
            catch (Exception ex)
            {
                return ex.Message.ToString();
            }
            var t = "error occured !!!";
            return Convert.ToString(t);
        }
  }

 Getting error : Connection failure (Access denied)

Give me some solution.
Thanks