GridView中DropDownList更新问题

gridview普通模板是label，点击更新是变成dropdownlist，并在后台绑定。
代码：    /// <summary>
    /// 编辑
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void gvBrand_RowEditing(object sender, GridViewEditEventArgs e)
    {
        gvBrand.EditIndex = e.NewEditIndex;
        GetData();
        DropDownList ddlServies = (DropDownList)gvBrand.Rows[gvBrand.EditIndex].Cells[2].FindControl("ddlServies");
        Label lbCnameVisble = (Label)gvBrand.Rows[gvBrand.EditIndex].Cells[3].FindControl("lbCnameVisble");
        dtBrand = brandBll.GetList("").Tables[0];
        ddlServies.DataSource = dtBrand;
        ddlServies.DataTextField = "Cname";
        ddlServies.DataValueField = "BrandId";
        ddlServies.DataBind();
        ddlServies.SelectedValue = lbCnameVisble.Text.ToString();
    }
点击保存:
/// <summary>
    /// 保存
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void gvBrand_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {
        string bId = gvBrand.DataKeys[e.RowIndex].Value.ToString();
        DropDownList ddlServies = (DropDownList)gvBrand.Rows[gvBrand.EditIndex].Cells[2].FindControl("ddlServies");
        TextBox txtName = (TextBox)gvBrand.Rows[gvBrand.EditIndex].Cells[1].FindControl("txtName");
     
        try
        {
            bsModel.BsId =int.Parse(bId);
            bsModel.BsName = txtName.Text.ToString();
            string s = ddlServies.SelectedValue.ToString();--试了下，取不到值，
            bsModel.BsBrandId = int.Parse(ddlServies.SelectedValue.ToString());--在这报错

            bsBll.Update(bsModel);
        }
        catch(Exception ex)
        {
            throw ex;
        }

    } --------------------编程问答-------------------- 别沉了啊，各位高手来支招啊
--------------------编程问答-------------------- 楼主试下这中方式
：
  string dept_code=(GridView1.Rows[e.RowIndex].FindControl("TextBox1") as TextBox).Text ; --------------------编程问答-------------------- string s = (GridView1.Rows[e.RowIndex].Cells[0].FindControl("DropDownList的ID") as DropDownList).SelectedValue; --------------------编程问答-------------------- Cells[0]是第一列，你按照你对应的列改下就行了 --------------------编程问答-------------------- 说不定不是取不到值，而是选定项的value是empty string呢？！ --------------------编程问答-------------------- 变成Textbox我到试过，但dropdownlist还没试过 --------------------编程问答-------------------- <ItemTemplate> 
<asp:DropDownList ID="ddlSort" runat="server" Width="98%">
  </asp:DropDownList>
 <asp:HiddenField ID="Hd_Sort" runat="server" Value='<%# Eval("BalSort")%>' />
</ItemTemplate>
 protected void gv_RowDataBound(object sender, GridViewRowEventArgs e)
  {
  if (e.Row.RowIndex != -1)
  { if (e.Row.RowState == DataControlRowState.Edit || e.Row.RowState == (DataControlRowState.Alternate | DataControlRowState.Edit))
  {
  ((DropDownList)e.Row.FindControl("ddlSort")).SelectedValue = ((HiddenField)e.Row.FindControl("Hd_Sort")).Value;
  }
  }
  }

 protected void gv_RowEditing(object sender, GridViewEditEventArgs e)
  {
  gv.EditIndex = e.NewEditIndex;
  string strSort = ((DropDownList)gv.Rows[e.NewEditIndex].FindControl("ddlSort")).SelectedValue.Trim();


  gv.EditIndex = -1;
  BindData();
  } 

补充：.NET技术 ,  ASP.NET