DropDownList和RequiredFieldValidator控件

Question

我正在使用网格视图中的ddl的dropdownlist控件和RequiredFieldValidator控件。

<asp:DropDownList ID="ddlInsert" runat="server" CssClass="normal" DataSourceID="sqlDataSource" DataTextField="Name"  DataValueField="ID" SelectedValue='<%# Bind("ID") %>'  AppendDataBoundItems="true">
              <asp:ListItem  Text="--Select--" Value="-1" Selected="True" />
              </asp:DropDownList>
               <asp:RequiredFieldValidator ID="requiredDDL" runat="server" ControlToValidate="ddlInsertRegion" ErrorMessage="*" InitialValue="-1" Display="Dynamic"></asp:RequiredFieldValidator>

但是这个验证器不起作用

Answer 1

验证器中的ControlToValidate =“ddlInsertRegion”但DropDownList控件ID为ID =“ddlInsert”