private void buttonDeleteCompany_Click(object sender, EventArgs e)
        {
            try
            {
                var result = MessageBox.Show("Are you sure ?", "Confirmation", MessageBoxButtons.OKCancel);

                if (result == DialogResult.OK)
                {
                    connectionDB.deleteCompanyFromList(comboBoxCompany.Text, comboBoxEmail.Text, comboBoxList.Text); // Use method to delete a company in the list
                    comboBox1_SelectedIndexChanged(null, null);
                }
            }
            catch
            {
                MessageBox.Show("Error, the list is not updated", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }