tis simple use array of arrays (or 2d arrays) see the attached file. see the code below 2 get an idea- 'WE CAN DO THIS IN A NUMBER OF WAYS
' BUT I THINK THIS IS A BEST(BUT NOT THE EASIEST) WAY
' TO REFLECT THE CHANGE OF COMBOBOX IN ANOTHER LIST BOX(OR COMBO)
'FIRST CREATE AN ARRAY OF ARRAYS(OPTION STRICT OFF) AND KEEP DUMPING ALL THE ELEMENTS
' OF THE ARRAY TO THE LIST BOX OF THE SELECTTED INDEX (IN COMBO BOX)
Public Class Form1
Inherits System.Windows.Forms.Form
Dim ar(2) As Object 'DECLARE ARRAY OF ARRYS
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
ListBox1.Items.Clear() Dim i As String
For Each i In ar(ComboBox1.SelectedIndex)
ListBox1.Items.Add(i)
Next End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'FIRST INITIALIZE THE LIST
Dim cities1() As String = {"Hyderabad", "Nellore", "Vijayawada", "Secunderabad"}
Dim cities2() As String = {"Chennai", "Coimbatore"}
Dim cities3() As String = {"Jammu", "Srinagar"}
ar(0) = cities1
ar(1) = cities2
ar(2) = cities3
'U CAN ALSO TRY 2DARRAYS BUT ALL THE ARRAY ELEMTS IN EACH ARRAY HAVE TO BE SAME IN
'NUMBER SO I THINK THIS METHID IS BEST AS THIS HAS NO SUCH RESTRICTIONS End Sub
End Class | 
