Deleting records (MDI forms)

Hello all,

I'm making an application and I need some help. My application has three child forms (school - class - students). So in every school there are classes and in every class there are students. I want to delete this items but only if there are no items in the main item. So if I want to delete a school my class and my students needs to be empty (or zero).

Can someone help me with this delete - code?

Code:

---

Private Sub mnuSchoolsDeleteItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuSchoolsDeleteItem.Click
    Dim DeleteName As String = school.Name_WN
    Try
      If MessageBox.Show("Are you sure " & school.Name_WN & " wilt delete?", "delete", MessageBoxButtons.YesNo, MessageBoxIcon.Information, MessageBoxDefaultButton.Button2) = MsgBoxResult.Yes Then
        schools.Delete(school)
        MessageBox.Show(DeleteName & " is deleted")
      Else
        MessageBox.Show(school.Name_WN & " isn't deleted")
      End If
    Catch
      MessageBox.Show(Err.Description, Err.Source)
    End Try
  End Sub

---

So this will delete everything (even if there's still classes in the school).
Can someone fix this?

Thank you very much,
Xler8tor

Has anyone already have a solution?