private void cmbRoom_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
cmbActivity.Items.Clear();
List <DataTypes> roomActivityCombo = new List <DataTypes>();
roomActivityCombo = viewModel.GetRoomActivityCombo();
for (int i = 0; i < roomActivityCombo.Count; i++)
{
if (roomActivityCombo[i].Room.ToString() == cmbRoom.SelectedValue.ToString())
{
cmbActivity.Items.Add(roomActivityCombo[i].Activity);
}
}
}