Where are the DataValueField values for a CheckBoxList stored?

Question

I have this CheckBoxList on a page:

Answer 1

Code

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        DataTable dt = new DataTable();
        dt.Columns.Add("tx");
        dt.Columns.Add("vl");
        DataRow dr = dt.NewRow();
        dr[0] = "asdas";
        dr[1] = "1";
        dt.Rows.Add(dr);
        dr = dt.NewRow();
        dr[0] = "456456";
        dr[1] = "2";
        dt.Rows.Add(dr);
        dr = dt.NewRow();
        dr[0] = "yjryut";
        dr[1] = "3";
        dt.Rows.Add(dr);
        dr = dt.NewRow();
        dr[0] = "yjrfdgdfgyut";
        dr[1] = "3";
        dt.Rows.Add(dr);
        dr = dt.NewRow();
        dr[0] = "34534";
        dr[1] = "3";
        dt.Rows.Add(dr);
        CheckBoxList1.DataSource = dt;
        CheckBoxList1.DataBind();
        foreach (ListItem li in CheckBoxList1.Items)
        {
            li.Attributes.Add("dvalue", li.Value);
        }
    }
}