private void B_simpan_Click(object sender, EventArgs e)
 {
     if (string.IsNullOrEmpty(C_id.Text))
     {
         Interaction.MsgBox("Kolom ID Tamu Masih Kosong!", Constants.vbInformation, "Pemberitahuan");
         C_id.Focus();
     }
     else if (string.IsNullOrEmpty(L_id.Text))
     {
         Interaction.MsgBox("Data Masih Kosong!", Constants.vbInformation, "Pemberitahuan");
         C_id.Focus();
     }
     else
     {
         simpan();
     }
 }
 private void B_simpan_Click(object sender, EventArgs e)
 {
     if (string.IsNullOrEmpty(C_id.Text))
     {
         Interaction.MsgBox("Kolom ID Kamar Masih Kosong!", Constants.vbInformation, "Pemberitahuan");
         C_id.Focus();
     }
     else if (string.IsNullOrEmpty(T_nama.Text))
     {
         Interaction.MsgBox("Kolom Nama Tamu Masih Kosong!", Constants.vbInformation, "Pemberitahuan");
         T_nama.Focus();
     }
     else if (C_jk.SelectedIndex == 0)
     {
         Interaction.MsgBox("Kolom Jenis Kelamin Tamu Masih Kosong!", Constants.vbInformation, "Pemberitahuan");
         C_jk.Focus();
     }
     else if (string.IsNullOrEmpty(T_alamat.Text))
     {
         Interaction.MsgBox("Kolom Alamat Tamu Masih Kosong!", Constants.vbInformation, "Pemberitahuan");
         T_alamat.Focus();
     }
     else if (string.IsNullOrEmpty(T_telp.Text))
     {
         Interaction.MsgBox("Kolom No. Telp Tamu Masih Kosong!", Constants.vbInformation, "Pemberitahuan");
         T_telp.Focus();
     }
     else if (string.IsNullOrEmpty(T_durasi.Text))
     {
         Interaction.MsgBox("Kolom Durasi Inap Masih Kosong!", Constants.vbInformation, "Pemberitahuan");
         T_durasi.Focus();
     }
     else
     {
         simpan();
     }
 }