private void AddBook()
{
Book book = new Book();
SqlConnections access = new SqlConnections();
book.Title = titletxt.Text;
book.Author = authortxt.Text;
book.ISBN = isbntxt.Text;
book.Year = yeartxt.Text;
book.Quantity = int.Parse(quantitytxt.Text);
book = access.AddBook(book);
DisplayData(searchtxt.text.Trim());
MetroFramework.MetroMessageBox.Show(this, "Successfully added");
this.Refresh();
}