ASP.NET GridView 内嵌 DropDownList 绑定数据「建议收藏」

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aspx页面代码：

    <asp:GridView ID="GridView2" runat="server">
        <Columns>
            <asp:BoundField HeaderText="ID" DataField="ID" />
            <asp:BoundField HeaderText="Name" DataField="Name" />
            <asp:BoundField HeaderText="Url" DataField="Url" />
            <asp:TemplateField>
                <ItemTemplate>
                    <asp:DropDownList ID="DropDownList2" runat="server" DataSource='<%# GetDate()%>'
                        DataValueField="Val" DataTextField="Text">
                    </asp:DropDownList>
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>

.cs代码： 绑定下拉数据源

        public List<DateInfo> GetDate()
        {
            List<DateInfo> info = new List<DateInfo>();
            using (this.context = new SDKDataContext())
            {
                var date = from c in this.context.DateInfo select c;
            }
            return info;
        }

给下拉显示初始数据

        public void BandingGridView()
        {
            using (this.context = new SDKDataContext())
            {
                var vData = from c in this.datacontext.DateInfo select c;
                this.GridView2.DataSource = vData;
                this.GridView2.DataBind();
                foreach (GridViewRow gvr in GridView2.Rows)
                {
                    DropDownList ddl = (DropDownList)gvr.FindControl("DropDownList2");
                    DateInfo info = new DateInfo();
                    info = vData[rows];
                    ddl.SelectedValue = info.Val.ToString();
                }
            }
        }