第一种方式，在前台页面代码中，捕获事件的方法，如：

QUOTE:
    <EditItemTemplate>
        <aspropDownList ID="ddl1" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddl1_SelectedIndexChanged">
            <asp:ListItem>1</asp:ListItem>
            <asp:ListItem>2</asp:ListItem>
            <asp:ListItem>3</asp:ListItem>
        </aspropDownList>
    </EditItemTemplate>
再从其后台代码中，添加事件处理代码：

QUOTE:
    protected void ddl1_SelectedIndexChanged(object sender, EventArgs e)
    ...{
        //.......
    }
第二种方式，在OnItemCreated事件的后台代码中，绑定要捕获的模板列控件（嵌套控件）的事件

QUOTE:
    private void rptForumGroups_ItemCreated(object sender, RepeaterItemEventArgs e)
    ...{

        if (e.Item.ItemType.ToString() == "Item" || e.Item.ItemType.ToString() == "AlternatingItem")
        ...{

            dgForums = (DataGrid)e.Item.FindControl("dgForums");    // 查找dgForums

            dgForums.DeleteCommand += new DataGridCommandEventHandler(dgForums_DeleteCommand);       // 捕获DeleteCommand事件

        }

    }
如何知道是那一行的控件触发了事件?
假如每一行数据中都用两DropDownList，ddl与自己行的另一ddl联动，前台页面代码：

QUOTE:
            <asp:Repeater ID="rptLoc" runat="server" OnItemDataBound="rptLoc_ItemDataBound">
                <ItemTemplate>
                    <aspropDownList ID="ddlCity" AutoPostBack="true" OnSelectedIndexChanged="ddlCity_SelectedIndexChanged" runat="server">
                    </asp:DropDownList>&nbsp;<asp:DropDownList ID="ddlLoc" runat="server">
                    </asp:DropDownList><br />
                </ItemTemplate>
            </asp:Repeater>
后台代码：

QUOTE:
    protected void ddlCity_SelectedIndexChanged(object sender, EventArgs e)
    ...{
        DropDownList ddl1 = sender as DropDownList;
            DropDownList ddl2 = ddl1.Parent.FindControl("ddlLoc") as DropDownList;
        //... int n = ((RepeaterItem)ddl1.Parent).ItemIndex;
        //......
    }