获取CheckBox在GridView模板列中的值

aspx:

    <asp:GridView ID="gvdeptusers" runat="server" DataKeyNames="id" AutoGenerateColumns="False" Width="100%" ShowHeader="False" OnRowDataBound="gvdeptusers_RowDataBound">
    <Columns>
        <asp:BoundField DataField="names" >
            <ItemStyle Width="8%" HorizontalAlign="Center" />                
            </asp:BoundField>
        <asp:BoundField DataField="deptname" >
            <ItemStyle Width="10%" HorizontalAlign="Center" />                
            </asp:BoundField>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:HiddenField ID="hdtype" runat="server" Value='<%# Eval("user_classid") %>' />
                <asp:CheckBox ID="cbusers" Text='<%# Eval("username") %>' runat="server" />
             </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

cs:

            string idStr = "";
            foreach (GridViewRow row in this.gvdeptusers.Rows)
            Response.End();

绑定选定值：

        protected void gvdeptusers_RowDataBound(object sender, GridViewRowEventArgs e)
        }

很简单的代码，怕忘记所以记录于此。