On my page, I'm filling in a CheckBoxList dynamically based on different user interactions.

        CheckBoxList1.DataSource = cmd.ExecuteReader
        CheckBoxList1.DataTextField = "name"
        CheckBoxList1.DataValueField = "subgroup_id"
        CheckBoxList1.DataBind()

 The values fill in the list, but when I submit the form the checkboxes don't show up as being selected.

    Dim cli As ListItem
    For Each cli In CheckBoxList1.Items
        If cli.Selected Then
            Response.Write("I've been selected:" + cli.Value.ToString + "<br />")
        Else
            Response.Write("I haven't been selected: " + cli.Value.ToString + "<br />")
        End If
    Next

 (in the case of this test code, I get back only "I haven't been selected" messages)

 Is there an error in my method? Is there something I'm missing? Is there a different way of doing this?

 

Do you populate the list  intiially in If Not Page.IsPostBack Then .... check. I'm after that you don't initialize the selections by redatabinding the list

Build and rebuild you checkboxlist in Page_Init.  This will allow ViewState to be loaded for the control, which recreates the dataview that the client had (including checked items).

(Never mind my post if you aren't building and adding the checkboxlist control dynamically.  I think I read the question with a bit of dyslexia.)

How would I go about doing that? Do I just put all the databinding into the Page_Init event handler or is there more?

I populate the list initially using a method called from Page_Load, this method handles filling in the content of the CheckBoxList in all cases.

Duh, it's always the simplest things that become the most confounding.  Thanks!