[RESOLVED] dropdownlist SelectionChange

I have some constant arraylists that are filled when a dropdownlist value is changed (based on the value of the DDL). When the first DDL is changed, I have a second DDL that binds to the values of the constant arraylist. However I ran the code and change the value of the ddl but it doesn't databind to the second DDL. Do I have to refresh the page? And if so how can I tell it to keep the selectedvalue of the first dropdownlist that was fires the SelectedIndexChanged event?

VB Code:

Private Sub ddlSection_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddlSection.SelectedIndexChanged
        If ddlSection.SelectedItem.Text = "500" Then 'this is the first ddl
            'Section500
            arrSection500.Clear()
            arrSection500.Add("Select Form")
            arrSection500.Add("500-10")
            arrSection500.Add("500-10C")
            arrSection500.Add("500-11")
 
            ddlForm.DataSource = arrSection500 'this is the second ddl i want to bind this arraylist to
            ddlForm.DataBind()
        End If

THanks again!!

I write in C#, not VB, so the code is slightly different, but my event contains the following code and executes perfectly:

VB Code:

System.Collections.ArrayList oAL = new ArrayList(0);
            oAL.Add("== Please Choose ==");
            oAL.Add("500-10");
            oAL.Add("500-10C");
            oAL.Add("500-11");
 
            ddlForm.DataSource = oAL;
            ddlForm.DataBind();

aah thanks!

another problem I'm having is I need my dropdownlist to be the value of a parameter in the url if the parameter exists, but it doesn't seem to work. Here's my code

VB Code:

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        'Put user code to initialize the page here
        If Not IsPostBack Then
            If Request.QueryString("section") = "" Then
                ddlSection.SelectedIndex = -1
            Else
                ddlSection.SelectedItem.Value = Request.QueryString("section")
            End If
        End If
    End Sub

Right now when the parameter equals something, my ddl still goes to my default value and not my value of my parameter.

foreach x as listitem in ddlSection.items
if x.Value = Request.QueryString("section") then
x.selected=true
exit for
endif
next

Thanks for the suggestion, what I did though was set AUTOPOSTBACK on and when it loads it grabs its value i was setting the parameter as from a different control

Thanks for all the help!