Repeater里的CheckBoxList多选后提交“更新”按钮，数据只插入了第一个SelectedValue

Question

下面是repater绑定及插入属性商品，选中多个插入后数据还是为1，不选正确    repater里不可用for循环、遍历
         /// <summary>
        /// 商品属性数据库绑定
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected void rptProperty_ItemDataBound(object sender, RepeaterItemEventArgs e)
        {
            if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
            {
                Label lblID = (Label)e.Item.FindControl("lbPID");
                Label lblInputType = (Label)e.Item.FindControl("lbInputType");
                TextBox txt = (TextBox)e.Item.FindControl("txtRptValue");
                DropDownList ddl = (DropDownList)e.Item.FindControl("ddlRptValue");
                CheckBoxList cb = (CheckBoxList)e.Item.FindControl("CheckBoxListproperty") as CheckBoxList;//++   2011-11-15
                if (lblInputType.Text == "0")
                {
                    ddl.Visible = false;
                    cb.Visible = false;
                }
                else if (lblInputType.Text == "2")//+++   2011-11-15
                {
                    ddl.Visible = false;
                    txt.Visible = false;                    
                    DataTable dt = DatabaseProvider.GetInstance().GetPropertyValueByPropertyID(lblID.Text);
                    if (dt.Rows.Count > 0)
                    {
                        cb.DataSource = dt;
                        cb.DataBind();
                    }
                }
                else
                {
                    cb.Visible = false;
                    txt.Visible = false;
                    DataTable dt = DatabaseProvider.GetInstance().GetPropertyValueByPropertyID(lblID.Text);
                    ddl.DataSource = dt;
                    ddl.DataBind();
                }                if (id != "0")
                    if (lblInputType.Text == "0") txt.Text = DatabaseProvider.GetInstance().GetPropertyValuePlus(id, lblID.Text);
                    else if (lblInputType.Text == "2")
                    {
                        foreach (ListItem li in cb.Items)//++  2011-11-16
                        {
                            DataTable dt = DatabaseProvider.GetInstance().GetProductValueByProductID(id);
                            foreach (DataRow dr in dt.Rows)
                            {
                                if (li.Value == dr["ValueID"].ToString())
                                {
                                    if (li.Value.Trim() != "")
                                    {
                                        cb.SelectedValue = li.Value;
                                        break;
                                    }
                                }
                            }
                        }                    }
                    else
                    {
                        foreach (ListItem li in ddl.Items)
                        {
                            DataTable dt = DatabaseProvider.GetInstance().GetProductValueByProductID(id);
                            string ids = "";
                            foreach (DataRow dr in dt.Rows)
                            {
                                if (li.Value == dr["ValueID"].ToString())
                                {
                                    if (li.Value.Trim() != "")
                                    {
                                        ddl.SelectedValue = li.Value;
                                        break;
                                    }
                                }
                            }
                        }
                    }
            }
        }        /// <summary>
        /// 插入属性商品
        /// </summary>
        /// <param name="id"></param>
        private void ProcessPropertyList(string productid)
        {
            //插入之前先删除所有扩展属性
            DatabaseProvider.GetInstance().DeleteProductValue(productid);
            DatabaseProvider.GetInstance().DeletePorpertyValuePlus(productid);            foreach (RepeaterItem i in rptProperty.Items)
            {
                DropDownList ddl = (DropDownList)i.FindControl("ddlRptValue");
                TextBox txt = (TextBox)i.FindControl("txtRptValue");
                CheckBoxList cb = (CheckBoxList)i.FindControl("CheckBoxListproperty") as CheckBoxList;//++  2011-11-16
                if (ddl.SelectedValue.Length > 0)  // 下拉列表
                {
                    ProductValue info = new ProductValue();
                    info.ProductID = int.Parse(productid);
                    info.ValueID = int.Parse(ddl.SelectedValue);
                    info.IsSelect = 1;
                    DatabaseProvider.GetInstance().InsertProductValue(info);
                }
                if (txt.Text.Length > 0)          //手工填写
                {
                    Label lblID = (Label)i.FindControl("lbPID");
                    DatabaseProvider.GetInstance().InsertProperyValuePlus(lblID.Text, productid, utils.CheckStr(txt.Text.Trim()));
                }                if (cb.SelectedValue.Length > 0)//++    2011-11-16   复选
                {
                    ProductValue info = new ProductValue();
                    info.ProductID = int.Parse(productid);
                    info.ValueID = int.Parse(cb.SelectedValue);
                    info.IsSelect = 1;
                    DatabaseProvider.GetInstance().InsertProductValue(info);                    //string name = utils.CheckStr(this.txtSelfProperty.Text);
                    //string value = utils.CheckStr(this.txtSelfPropertyValue.Text);
                    //ProductProperty info = new ProductProperty();
                    //info.Name = name;
                    //info.Value = value;
                    //info.IsInOrder = 0;
                    //info.ProductID = int.Parse(id);
                    //DatabaseProvider.GetInstance().InsertPropertyByProductId(info);
                }
            }
        }