private void btnAddAuthor_Click(object sender, EventArgs e)
{
string authorName = txtAuthorName.Text;
// eger null veya boshdursa
if (string.IsNullOrEmpty(authorName))
{
// ERROR mesajinin verilmersi
MessageBox.Show("Author name is not valid", "Failed!",
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
// eger AuthorListde bu ad varsa
if (AuthorList.ContainsAuthorName(authorName))
{
// ERROR mesaji verilir
MessageBox.Show("Author name is duplicate", "Failed!",
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
//user uyqun author adini daxil etdi ve bu addan yoxdur
//bu halda yeni author-un AuthorList-e elave edilmesi
AuthorList.AddAuthor(new Author(authorName));
// Elave edildikden sonra setrin bosh gorsedilmesi
txtAuthorName.Text = "";
// Melumat mesajinin verilmesi
MessageBox.Show("New author was successfully added", "Success!",
MessageBoxButtons.OK, MessageBoxIcon.Information);
}