Hi ,
Try with this
make Auto postback true to first checklistbox. then write this code selected indexchenged event
Protected Sub CheckBoxList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles CheckBoxList1.SelectedIndexChanged
For i As Integer = 0 To CheckBoxList1.Items.Count - 1
If CheckBoxList1.Items(i).Selected = True Then
CheckBoxList2.Items(i).Selected = True
Else
CheckBoxList2.Items(i).Selected = False
End If
Next
End Sub
Regards,
Pal