在DetailView中使用DropDownList進行插入，但插入后該字段還是空白，請問是哪里有誤呢？protected void DetailsView1_ItemUpdating(object sender, DetailsViewUpdateEventArgs e)??? {??? DetailsView dv = (DetailsView)GridView1.FindControl("DetailsView1");? DropDownList d = (DropDownList)dv.FindControl("DropDownList2");? this.SqlDataSource1.UpdateParameters.Add("bumen",d.SelectedValue);? }