EventManager.deleteEvent C# (CSharp) Method

    private bool deleteEvent(string eventType)
    {
        if (!checkForEvent(eventType)) return false;
        _listeners.Remove(eventType);
        return true;
    }

        private void deleteEventButton_Click(object sender, EventArgs e)
        {
            DialogResult result = MessageBox.Show("Are you sure you want to delete event?", "Event Managment System", MessageBoxButtons.YesNo, MessageBoxIcon.Question);

            if (result == DialogResult.Yes)
            {
                Event ev = (Event)eventListView.SelectedObject;
                if (eM.deleteEvent(ev))
                {
                    eventBindingSource.Remove(ev);
                }
            }
        }