[احمد خطاب]

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
If TextBox1.Text.Trim = "" Or TextBox2.Text.Trim = "" Then Exit Sub

Button1.Enabled = False
Using con As New OleDb.OleDbConnection(str)
Using cm As New OleDb.OleDbCommand("", con)
cm.CommandText = "insert into country (countryname) values(@countryname)"
cm.Parameters.AddWithValue("@countryname", TextBox1.Text)
If con.State = ConnectionState.Closed Then con.Open()
cm.ExecuteNonQuery()

cm.Parameters.Clear()
'انتبه اجعل الاتصال مفتوح لتحصل على آخر رقم اي دي
cm.CommandText = "select@@identity"
Dim id As Integer
If con.State = ConnectionState.Closed Then con.Open()
id = cm.ExecuteScalar
If con.State = ConnectionState.Open Then con.Close()
cm.Parameters.Clear()
If con.State = ConnectionState.Closed Then con.Open()

For Each h As String In TextBox2.Text.Split(vbNewLine)
cm.Parameters.Clear()
cm.CommandText = "insert into city (countryid,cityname) values(@countryid,@cityname)"
cm.Parameters.AddWithValue("@countryid", id)
cm.Parameters.AddWithValue("@cityname", h)
cm.ExecuteNonQuery()
Next
If con.State = ConnectionState.Open Then con.Close()
End Using
End Using
gd()
Button1.Enabled = True
MsgBox("تم حفظ الدولة ومدنها", MsgBoxStyle.Information, "")


ده كود الاضافة ازاى اعمل منه كود حذف