public async void OnSingIn() { try { JObject jRes = await myHttpClient.sendHttpPostAsyncJson(Constants.ApiSignIn, user); if (user.email.Length == 0 || user.password.Length == 0) { await App.Current.MainPage.DisplayAlert("Empty fields", "You must fill all the fields.", "OK"); } else if (!MyHelper.IsValidEmail(user.email.Trim())) { await App.Current.MainPage.DisplayAlert("Invalid email", "Enter a valid email : [email protected]", "OK"); } else if ((bool)jRes["HttpClient error"]) { await App.Current.MainPage.DisplayAlert("Connection failed", "Connection failed.", "OK"); } else if ((bool)jRes["HttpClient parsing error"]) { } else { if ((bool)jRes["API error"]) { await App.Current.MainPage.DisplayAlert("Connection failed", "Connection failed.", "OK"); } else if (!(bool)jRes["LoggedIn"]) { await App.Current.MainPage.DisplayAlert("Message", (string)jRes["Message"], "OK"); } else if ((bool)jRes["LoggedIn"]) { await MyHelper.SaveValueForAppAsync("LoggedIn", "true"); await MyHelper.SaveValueForAppAsync("JWT", (string)jRes["JWT"]); await MyHelper.SaveValueForAppAsync("id_user", (string)jRes["id_client"]); JObject user_info = (JObject)jRes["user_info"]; await MyHelper.SaveValueForAppAsync("user_info", user_info.ToString()); user = user_info.ToObject <Client>(); App.client = user; //await App.Current.MainPage.DisplayAlert("Connection successful", (string)jRes["JWT"], "OK"); App.Current.MainPage = new AppShell(); } } } catch (Exception ex) { await App.Current.MainPage.DisplayAlert("Connection failed", "Connection failed.", "OK"); } }