public async void RemoveSubject()
{
ContentDialog RemoveDialog = new ContentDialog
{
Title = "Reference removal",
Content = "There can be many references to this Subject in courses, these references will be dropped, and can not be undone. Are you sure to continue?",
CloseButtonText = "No",
PrimaryButtonText = "Yes"
};
ContentDialogResult result = await RemoveDialog.ShowAsync();
if (result == ContentDialogResult.Primary)
{
SubjectManager.RemoveSubject(selected);
}
}