private void button5_Click(object sender, EventArgs e) { string adminnum = textBox1.Text; string fullname = textBox2.Text; if (DBMng.validateManager(adminnum, fullname)) { this.Hide(); ManagerDisplay newform = new ManagerDisplay(); newform.ShowDialog(); } else { textBox1.Text = ""; textBox2.Text = ""; this.label3.Visible = true; } }