1、把数据绑定到CheckBoxList中

特别要注意加载顺序

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";//绑定的字段名
                this.CheckBoxList1.DataValueField = "userid";//绑定的值
                this.CheckBoxList1.DataBind();
            }
}

2、循环读取出来

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+".";
                }
            }
}

3、CheckBoxList取值
string strrighgs = "";
for (int i = 0; i < CheckBoxList1.Items.Count; i++)
{
    if (CheckBoxList1.Items[i].Selected == true)
    {
        strrighgs += CheckBoxList1.Items[i].Value+"|";
    }

}

string str = "";
foreach (ListItem li in CheckBoxList1.Items)
{
   if (li.Selected == true)
   {
      str += li.Value+";";
   }
}

Response.Write(str);
Response.End();
CheckBoxList取值及勾选
string[] strtemp = strapp.Split('|');
foreach (string str in strtemp)
{
   for (int i = 0; i < CheckBoxList1.Items.Count; i++)
   {
      if (CheckBoxList1.Items[i].Value == str)
      {
         CheckBoxList1.Items[i].Selected = true;
      }
   }
}