//save button clicked
async void SavleClicked(object sender, System.EventArgs e)
{
if (configurationModel.synchronization && string.IsNullOrEmpty(configurationModel.duration))
{
await DisplayAlert(ResourcesValues.AppName, ResourcesValues.FillDurationMessage, ResourcesValues.OkMessage);
}
else
{
await appServices.SaveConfiguration(configurationModel);
await Navigation.PopModalAsync(false);
}
}