/// <summary>
/// The button that adds the book and check all the fields.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btn_AddBook_Click(object sender, EventArgs e)
{
var author = AS.All().Where(a => a.Name == txt_Author.Text.Trim()).FirstOrDefault();
if (txt_ISBN.Text.Trim() == "" || txt_Title.Text.Trim() == "" || txt_Description.Text.Trim() == "" || txt_Author.Text.Trim() == "")
{
MessageBox.Show("Please enter all the fields.");
}
else if (BS.BookAlreadyExists(txt_ISBN.Text.Trim()))
{
MessageBox.Show("This Book already exists");
}
else
{
if (author != null)
{
Book book = new Book()
{
ISBN = txt_ISBN.Text.Trim(),
Title = txt_Title.Text.Trim(),
Description = txt_Description.Text.Trim(),
Author = author
};
try
{
BS.Add(book);
} catch (ArgumentNullException ex)
{
MessageBox.Show(ex.Message);
}
}
else
{
Author author2 = new Author()
{
Name = txt_Author.Text.Trim()
};
Book book = new Book()
{
ISBN = txt_ISBN.Text.Trim(),
Title = txt_Title.Text.Trim(),
Description = txt_Description.Text.Trim(),
Author = author2
};
AS.Add(author2);
BS.Add(book);
this.Close();
}
}
}
