protected override async void OnAppearing()
{
base.OnAppearing();
patients = await PatientLogic.GetPatients();
HttpClientHandler httpClientHandler = new HttpClientHandler();
httpClientHandler.ServerCertificateCustomValidationCallback =
(message, cert, chain, errors) => { return(true); };
var client = new System.Net.Http.HttpClient(httpClientHandler);
System.IO.Stream imagestream = await client.GetStreamAsync(General.URL + "/Content/title.jpg");
imageLogin.Source = ImageSource.FromStream(() => imagestream);
}