private void FormDeleteOfBook_Load(object sender, EventArgs e)
        {
            textBoxId.MaxLength    = 5;
            textBoxJudul.MaxLength = 45;

            listOfTipeBuku = TipeBuku.BacaData("", "");
            comboBoxTipeBuku.DataSource    = listOfTipeBuku;
            comboBoxTipeBuku.DisplayMember = "JenisBuku";
            comboBoxTipeBuku.DropDownStyle = ComboBoxStyle.DropDownList;

            listOfPenerbit = Penerbit.BacaData("", "");
            comboBoxPenerbit.DataSource    = listOfPenerbit;
            comboBoxPenerbit.DisplayMember = "NamaPenerbit";
            comboBoxPenerbit.DropDownStyle = ComboBoxStyle.DropDownList;

            comboBoxPenerbit.Enabled = false;
            comboBoxTipeBuku.Enabled = false;
            textBoxHarga.Enabled     = false;
            textBoxHarga.Enabled     = false;
            textBoxJudul.Enabled     = false;
            textBoxStok.Enabled      = false;
        }
        private void FormChangeBook_Load(object sender, EventArgs e)
        {
            textBoxId.MaxLength    = 5;
            textBoxJudul.MaxLength = 45;

            listOfTipeBuku = TipeBuku.BacaData("", "");
            comboBoxTipeBuku.DataSource    = listOfTipeBuku;
            comboBoxTipeBuku.DisplayMember = "JenisBuku";
            comboBoxTipeBuku.DropDownStyle = ComboBoxStyle.DropDownList;

            listOfPenerbit = Penerbit.BacaData("", "");
            comboBoxPenerbit.DataSource    = listOfPenerbit;
            comboBoxPenerbit.DisplayMember = "NamaPenerbit";
            comboBoxPenerbit.DropDownStyle = ComboBoxStyle.DropDownList;

            textBoxJudul.Text = "";
            textBoxHarga.Text = "";
            textBoxStok.Text  = "";
            textBoxId.Text    = "";

            textBoxHarga.TextAlign = HorizontalAlignment.Right;
            textBoxStok.TextAlign  = HorizontalAlignment.Right;
        }