asp.net checkboxlist綁定資料讀取出來

1.把資料繫結到CheckBoxList中

protected void Page_Load(object sender, EventArgs e){    if (!Page.IsPostBack)    {        SqlConnection con = GetDBCon.GetCon();        con.Open();        SqlDataAdapter sda = new SqlDataAdapter("select * from admin", con);        DataSet ds = new DataSet();        sda.Fill(ds,"admin");        this.CheckBoxList1.DataSource = ds.Tables[0];        this.CheckBoxList1.DataTextField = "username";//綁定的欄位名        this.CheckBoxList1.DataValueField = "userid";//綁定的值        this.CheckBoxList1.DataBind();           }} 

2.迴圈讀取出來

protected void CheckBoxList1_SelectedIndexChanged(object sender, EventArgs e){    this.Lab2.Text = "";    for (int i = 0; i < CheckBoxList1.Items.Count; i++)    {        if (this.CheckBoxList1.Items[i].Selected)        {            this.Lab2.Text = this.Lab2.Text+CheckBoxList1.Items[i].Text+".";        }    }}