private void Frm_Add_Book_Load(object sender, EventArgs e)
{
BL_Frm_Add_Book M = new BL_Frm_Add_Book();
for (int i = 0; i < M.Select().Rows.Count; i++)
{
cbSubject.Items.Add(M.Select().Rows[i][1].ToString());
}
}
private void btnAdd_Click(object sender, EventArgs e)
{
BL_Frm_Add_Book M = new BL_Frm_Add_Book();
M.ISBN = txtISBN.Text;
M.Title = txtTitle.Text;
M.Subject = cbSubject.SelectedIndex + 1;
M.Writer = txtAuthor.Text;
M.publisher = txtPublisher.Text;
M.Year_Date = txtYear.Text;
M.NumPage = int.Parse(txtNbPages.Text);
M.Price = int.Parse(txtPrice.Text);
M.Add();
//Reset text boxs
txtISBN.Focus();
txtISBN.ResetText();
txtTitle.ResetText();
cbSubject.SelectedIndex = -1;
txtAuthor.ResetText();
txtPublisher.ResetText();
txtYear.ResetText();
txtNbPages.ResetText();
txtPrice.ResetText();
}