private async System.Threading.Tasks.Task CheckIfClientExistsAsync()
{
TaskCompletionListener clientExistsListener = new TaskCompletionListener();
clientExistsListener.Succes += ClientExistsListener_Succes;
clientExistsListener.Failure += ClientExistsListener_Failure;
progress = new ProgressDialog(this);
progress.Indeterminate = false;
progress.SetProgressStyle(Android.App.ProgressDialogStyle.Spinner);
progress.SetMessage("Se efectueaza migrarea..Asteptati...");
progress.SetCancelable(false);
progress.Show();
await System.Threading.Tasks.Task.Delay(5000);
_firestoreDb.EnableNetwork();
_firestoreDb.Collection("Medics").Document(medicSelected.Id).Collection("Clients").Document(clientLoggedData.Id).Get()
.AddOnSuccessListener(clientExistsListener).AddOnFailureListener(clientExistsListener);
}