private void TambahData()
 {
     try
     {
         if (tbNama.Text != "" && gender != "" && tbUmur.Text != "")
         {
             using (var db = new DaftarUser())
             {
                 user = new User
                 {
                     Nama          = tbNama.Text,
                     Jenis_Kelamin = gender,
                     Umur          = tbUmur.Text,
                 };
                 db.Users.Add(user);
                 db.SaveChanges();
             }
             MessageBox.Show("Hai " + _namaUser + "! Selamat Datang!");
             mainMenu formMenu = new mainMenu();
             var      result   = formMenu.ShowDialog();
         }
         else
         {
             MessageBox.Show("Nama, Jenis Kelamin, dan Umur Anda harus diisi !");
         }
     }
     catch (Exception e)
     {
         MessageBox.Show(e.Message, "Format Nama dan Umur harus benar!");
     }
 }
 private void btnBackmenu_Click(object sender, EventArgs e)
 {
     this.Hide();
     mainMenu     mainmenu = new mainMenu();
     DialogResult results  = mainmenu.ShowDialog();
 }