//Try catch skal implementeres her
public async void HentDataFraDiskenAsync()
{
this.KListe.Clear();
StorageFile file = await localfolder.GetFileAsync(filnavn);
string jsonText = await FileIO.ReadTextAsync(file);
KListe.HentDataFraDiskenAsync(jsonText);
}
public void SletElev()
{
KListe.Remove(SelectedElev);
}
public void AddNewElev()
{
KListe.Add(NewElev);
}