private void btnDelGroup_Click(object sender, EventArgs e)
{
DialogResult question = MessageBox.Show("Are you sure?", "All book list in for this author will be deleted!", MessageBoxButtons.YesNo);
if (question == DialogResult.Yes)
{ //========================= Group-un silinmesi ====================================
// downcast edirik ve comboBoxda secilmish groupun ID nomresini groupID-ye veririk
string groupID = ((GroupCombo)cmbDel.SelectedItem).Value;
// GroupList-den secilmish qrupu ID-ye gore tapib veririk Group tipinde groupToDeleted-e
// bir nov apcast olunur ki Group-un icinden lazim olana catsin
Group groupToDeleted = GroupList.GetGroupById(groupID);
// GroupList-den Group classina girib Groups siyahisindan
// ID-ci uyqun geleni silirik
GroupList.Groups.Remove(groupToDeleted);
//==================================================================================
//=========== Silinen Group-un Student siyahisinin silinmesi =====================//
// silinen group-un icindeki studentleri yeni List massivine yiqiriq
List <Student> studentToBedeleted = StudentList.GetStudentsByGroup(groupToDeleted);
// ve hemin massiv siralanir ve siyahidaki studentName-ler silinir
foreach (Student studentName in studentToBedeleted)
{
StudentList.Students.Remove(studentName);
}
// Group-larin siyahisi yenilenir
UpdateCombo();
}
else
{
MessageBox.Show("You are cancelled deletion!");
}
}
