Where are the DataValueField values for a CheckBoxList stored?

Question

I have this CheckBoxList on a page:

Answer 1

Removing caused an issue in some old code I was working on. I was getting this error. Once I got that error I realized it was too risky of a change.

To fix this, I ended up extending CheckBoxList and overriding the Render method to add an additional attribute containing the value to each list item:

public class CheckBoxListExt : CheckBoxList
{
    protected override void Render(HtmlTextWriter writer)
    {
        foreach (ListItem item in this.Items)
        {
            item.Attributes.Add("data-value", item.Value);
        }

        base.Render(writer);
    }
}

This will render the data-value attribute on the outer span tag.