private void btnDel_Click(object sender, EventArgs e)
{
DialogResult question = MessageBox.Show("Are you sure?", "All books for this author will be deleted!", MessageBoxButtons.YesNo);
if (question == DialogResult.Yes)
{
//========================= Author-un silinmesi ====================================
// downcast edirik ve comboBoxda secilmish author ID nomresini authorID-ye veririk
string authorID = ((AuthorComboBox)cmbAuthorList.SelectedItem).Value;
// AuthorList-den secilmish author ID-ye gore tapib veririk Author tipinde authorToDeleted-e
// bir nov apcast olunur ki Author-un icinden lazim olana catsin
Author authorToDeleted = AuthorList.GetAuthorByID(authorID);
// AuthorList-den Author classina girib Authors siyahisindan
// ID-ci uyqun geleni silirik
AuthorList.Authors.Remove(authorToDeleted);
//==================================================================================
//=========== Silinen Author-un Book siyahisinin silinmesi =====================//
// silinen group-un icindeki studentleri yeni List massivine yiqiriq
List <Book> bookToBedeleted = BookList.GetBookByGroup(authorToDeleted);
// ve hemin massiv siralanir ve siyahidaki bookName-ler silinir
foreach (Book bookName in bookToBedeleted)
{
BookList.Books.Remove(bookName);
}
UpdateAuthorList();
}
else
{
MessageBox.Show("You are cancelled deletion!");
}
}