// This event handler is fired when the delete activity button is clicked. It deletes an activity from the list of
// activities that a group is involved with.
private void BtnDeleteActivity_Click(object sender, RoutedEventArgs e)
{
try
{
GroupActivityVM activity = (GroupActivityVM)dgGroupActivities.SelectedItem;
_activityManager.DeleteGroupActivity(activity.ActivityID, activity.GroupID);
dgGroupActivities.ItemsSource = _groupManager.RetrieveActivitiesByGroupID(lbUserGroups.SelectedItem.ToString());
}
catch (Exception)
{
MessageBox.Show("You must make an Activity selection.");
}
}