private void btnLogin_Click(object sender, EventArgs e) { if (string.IsNullOrEmpty(txtLogin.Text) || string.IsNullOrEmpty(txtSenha.Text)) { MessageBox.Show("Os campos de login e senha não deverão estar vazios", "Aviso!", MessageBoxButtons.OK, MessageBoxIcon.Exclamation); return; } string _msgErro = "Login e/ou senha inválido(s)"; BusinessOperations businessOperations = new BusinessOperations(); AdministracaoPlayersVip administracaoPlayersVip = businessOperations.BusinessAdministracaoPlayersVip(new AdministracaoPlayersVip { AdminLogin = txtLogin.Text, AdminPassword = txtSenha.Text }); if (administracaoPlayersVip == null) { MessageBox.Show(_msgErro, "Aviso!", MessageBoxButtons.OK, MessageBoxIcon.Exclamation); lblMsgSistema.ForeColor = Color.Red; lblMsgSistema.Visible = true; lblMsgSistema.Text = _msgErro + ". Tente novamente!"; return; } else { FrmMain frmMain = new FrmMain(administracaoPlayersVip); Hide(); frmMain.Show(); } }