// check user password func public void checkUserID() { if (txt_UserName.TextLength == 0 || txt_Password.TextLength == 0) { lb_provideAusernameAndpassword.Visible = true; lb_warning.Visible = false; timer1.Start(); } else { bd = new Class_Business(); //check user password if (bd.Login(ref err, txt_UserName.Text, txt_Password.Text)) { A_UName.ID_USER = txt_UserName.Text; this.Hide(); Main f = new Main(); f.ShowDialog(); lb_provideAusernameAndpassword.Visible = lb_warning.Visible = false; } else { lb_provideAusernameAndpassword.Visible = false; lb_warning.Visible = true; timer1.Start(); } } }