private void BtnLogin_Click(object sender, EventArgs e) { HadoUIServiceClient client = new HadoUIServiceClient(); var user = client.Login(txtBoxUserName.Text, txtPassword.Text); if (user != null) { //Application.Run(new SplashScreen()); this.Hide(); MainForm mainForm = new MainForm(user); mainForm.Show(); } else { MessageBox.Show("Kullanıcı Adı veya Şifre Yanlış", "Uyarı", MessageBoxButtons.OK, MessageBoxIcon.Warning, MessageBoxDefaultButton.Button2); } }