private void btnAddEntry_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                // sets headache type to headacheObj
                headacheObj.AcheType = comboAcheType.Text;
                // sets pain intensity to headacheObj
                Int32.TryParse(PainLevel.Text.ToString(), out int painLvl);
                headacheObj.PainLevel = painLvl;

                bool result = DatabaseAccess.AddToSQLite(headacheObj);

                if (result == false)
                {
                    MessageBox.Show("Could not add entry", "Adding error", MessageBoxButton.OK);
                }



                // closes this window
                this.Close();
            }

            catch (InvalidOperationException ex) // Näyttää virheviestin
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK);
            }
        }