public async Task TryAccess() { memberDatabase = new MemberDatabase(); var members = memberDatabase.GetMembers(); int RowCount = 0; int membcount = members.Count(); RowCount = Convert.ToInt32(membcount); if (RowCount > 0) { var mx = memberDatabase.GetMembers(); var mx_first = mx.FirstOrDefault(); var tok_ty = mx_first.Token_Type; var acc_tok = mx_first.Access_Token; var userName = mx_first.UserName; var pass = mx_first.Pass; var id = mx_first.ID; HttpClient client = new HttpClient(); client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue(tok_ty, acc_tok); client.DefaultRequestHeaders.Add("api-version", "1.0"); client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json")); var values = new Dictionary <string, string> { { "usuario", userName }, { "contraseña", pass } }; var content = new FormUrlEncodedContent(values); var response = await client.PostAsync("http://aige.sytes.net/ApiRestSAM/api/CITASAPP/Acceso", content); switch (response.StatusCode) { case (System.Net.HttpStatusCode.OK): Application.Current.MainPage = new NavigationPage(new PageNav()); break; case (System.Net.HttpStatusCode.BadRequest): testxy.Text = "no good"; break; case (System.Net.HttpStatusCode.Forbidden): await DisplayAlert("Su sesión ha caducado", "Reingrese sus datos", "ok"); memberDatabase.DeleteMember(id); Application.Current.MainPage = new NavigationPage(new AuthPage()); break; //500 case (System.Net.HttpStatusCode.InternalServerError): string status = "Nuestros servidores estan en mantenimiento"; testxy.Text = status; break; } //Application.Current.MainPage = new NavigationPage(new PageNav()); } else { //await DisplayAlert("No existe registro de usuario", "Por favor acceda con su usuario y contraseña. Si no cuenta con ellos " + // "pongase en contacto con su provedor", "Continuar"); Application.Current.MainPage = new NavigationPage(new AuthPage()); } }