关于dropdownlist的问题

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本人初学.NET,经常碰到些问题,一般自己查下资料,都可以搞定,今天这个问题实在是搞不定,希望朋友们帮忙.....

首先参考图片

本人想在货品明细下的一个表格下添加几行明细,每行明细的第一个单元格内是一个下拉框,是货品列表,

其它的列,如:类型,规格,单位,价格,货币,初始化时都是空的,当下拉框下拉时,触发selectedIndexChanged事件,

类型,规格,单位,价格,货币就显示所选择的货品的明细,我只要填写数量和金额,就可以搞定这张订单了.

以上是我的意图,但是在写代码时,发现下拉框的OnSelectedIndexChanged会有问题,报错为

编译器错误信息: CS0122: “System.Web.UI.WebControls.ListControl.OnSelectedIndexChanged(System.EventArgs)”不可访问，因为它受保护级别限制
不知道怎么办,希望达人帮忙,联系QQ:4894723或Email:f-h2001@163.com

//-----------添加明细行--------------------- for (int i = 0; i <= 4; i++) { TableRow tr = new TableRow(); tr.Attributes.Add("onMouseOver", "this.style.background='#A0c6e5'"); tr.Attributes.Add("onMouseOut", "this.style.background='#FFFFFF'"); //名称 TableCell td1 = new TableCell(); DropDownList GoodsID = new DropDownList(); Goods gs = new Goods(); GoodsID.ID = "GoodsID_"+i; GoodsID.DataSource = gs.ShowGoodsInfoList(); GoodsID.DataTextField = "GoodsName"; GoodsID.DataValueField = "GoodsID"; GoodsID.DataBind(); GoodsID.Items.Insert(0, li); GoodsID.AutoPostBack = true; //GoodsID.OnSelectedIndexChanged = GoodsID_SelectedIndexChanged(Convert.ToInt32(GoodsID.SelectedValue), i); //GoodsID.SelectedIndexChanged += new System.EventHandler(GoodsID_SelectedIndexChanged); td1.Controls.Add(GoodsID); tr.Cells.Add(td1); //类型 TableCell td2 = new TableCell(); Label TypeName = new Label(); TypeName.ID = "TypeName_" + i; td2.Controls.Add(TypeName); tr.Cells.Add(td2); //规格 TableCell td3 = new TableCell(); Label Spec = new Label(); Spec.ID = "Spec_" + i; td3.Controls.Add(Spec); tr.Cells.Add(td3); //单位 TableCell td4 = new TableCell(); Label Unit = new Label(); Unit.ID = "Unit_" + i; td4.Controls.Add(Unit); tr.Cells.Add(td4); //价格 TableCell td5 = new TableCell(); Label Price = new Label(); Price.ID = "Price_" + i; td5.Controls.Add(TypeName); tr.Cells.Add(td5); //货币 TableCell td6 = new TableCell(); Label CurrencyName = new Label(); CurrencyName.ID = "CurrencyName_" + i; td6.Controls.Add(CurrencyName); tr.Cells.Add(td6); //数量 TableCell td7 = new TableCell(); TextBox Qty = new TextBox(); Qty.ID = "Qty_" + i; Qty.CssClass = "smallbox"; td7.Controls.Add(Qty); tr.Cells.Add(td7); //金额 TableCell td8 = new TableCell(); TextBox Amount = new TextBox(); Amount.ID = "Amount_" + i; Amount.CssClass = "smallbox"; td8.Controls.Add(Amount); tr.Cells.Add(td8); OrderDetailList.Rows.Add(tr); }