DropDownListSalesAC”有一个无效 SelectedValue，因为它不在项目列表中。

 protected void DropDownListCur_DataBinding(object sender, EventArgs e)
    {
        string strCustNo;
        string strddlName;
        strddlName = "DropDownListCur";
        string strColName;
        strColName = "cur_no";
        bool flag = false;
        DataRowView rowView = (DataRowView)FormView1.DataItem;
        strCustNo = rowView[strColName].ToString();

        DropDownList dd = (DropDownList)FormView1.FindControl(strddlName);
        for (int i = 0; i < dd.Items.Count; i++)
        {
            if (strCustNo == dd.Items[i].Text)
            {
                flag = true;
                break;
            }

        }
        if (flag == false)
            dd.Items.Add(strCustNo);

    }