private void Add_Role_button_Click(object sender, EventArgs e) { try { Oracle.CreateRole(MainForm.Login_Form.conn, Role_name_textBox.Text, Role_password_textbox.Text); MessageBox.Show("ĐA TAO ROLE " + Role_name_textBox.Text + " THANH CONG!!", "Succeed", MessageBoxButtons.OK, MessageBoxIcon.Information); MainForm.GetRoles(); this.Close(); } catch (Exception ex) { MessageBox.Show("ERROR:" + ex.Message, "Fail", MessageBoxButtons.OK, MessageBoxIcon.Error); } }