//method to delete a Sag from DB
        private void btn_SletSag_Click(object sender, EventArgs e)
        {
            //Initializes SagBLL and SagDAL
            sag = new SagBLL(SagsID());

            try
            {
                if (SagBLL.SagExists(SagsID()))
                {
                    //delete a Sag from DB
                    sag.SletSag(sag);
                }
                else
                {
                    MessageBox.Show("Der findes ikke nogen bolig i database med dette ID. Prøv venligst med en anden ID.");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }

            //Loader data fra databasen ind i datagridview
            SagUI_Load(sender, e);

            //clear all TextBoxes
            ClearAll();

            //disable all TextBoxes
            DisableAll();

            //enable BoligID TextBox
            sagID_txt.Enabled = true;
        }