private async Task <List <Runner> > GetRunnersbyEvent()
{
var returned = await RunnerServices.GetRunnersByEventID(Event.Id);
SelectedRunners = new ObservableCollection <Runner>(returned);
SelectedRunnersCount = SelectedRunners.Count;
foreach (var runner in SelectedRunners)
{
Runners.Remove(Runners.SingleOrDefault(i => i.Id == runner.Id));
}
IsBusy = false;
return(returned);
}