CalendarExtender不更新值

Question

我有一个带有日期字段的DetailsView，我想在用户编辑时使用CalendarExtender。

在将CalendarExtender应用于字段之前，我将其作为常规绑定字段，并且值正确更新。然后我将字段更改为模板字段并将CalendarExtender应用于它。日历弹出正确，文本框输入日期，但是当我单击编辑时，似乎没有输入任何值。

这是我的代码：

<asp:DetailsView ID="DetailsView2" runat="server" Height="50px" Width="330px" 
    DataSourceID="SqlDataSource2" CssClass="GridViewStyle" GridLines="None" 
    AutoGenerateRows="False" DataKeyNames="ID" >
    <Fields>
        <asp:BoundField DataField="EmployeeID" HeaderText="EmployeeID" 
            SortExpression="EmployeeID" />
        <asp:BoundField DataField="FirstName" HeaderText="FirstName" 
            SortExpression="FirstName" />
        <asp:BoundField DataField="LastName" HeaderText="LastName" 
            SortExpression="LastName" />

        <asp:BoundField DataField="SupervisorID" HeaderText="SupervisorID" 
            SortExpression="SupervisorID" />

        <asp:BoundField DataField="JobID" HeaderText="JobID" SortExpression="JobID" />


            <asp:TemplateField HeaderText="HireDate">
                <ItemTemplate>
                <asp:Label ID="Label1" runat="server" Text='<%# Eval("HireDate") %>'></asp:Label> 
                </ItemTemplate>

                <EditItemTemplate>
                <asp:TextBox ID="TextBox1" runat="server" Text='<%# Eval("HireDate") %>'> </asp:TextBox>
                <asp:CalendarExtender Format="MM/dd/yyyy" ID="CalendarExtender1" runat="server" TargetControlID="TextBox1"  Enabled="True" />
                </EditItemTemplate>


             </asp:TemplateField>

        <asp:CommandField ShowDeleteButton="True" ShowEditButton="True" 
            ShowInsertButton="True" />
    </Fields>


    <RowStyle CssClass="RowStyle" />
    <EmptyDataRowStyle CssClass="EmptyRowStyle" />
    <PagerSettings Mode="NumericFirstLast" PageButtonCount="5" />
    <PagerStyle CssClass="PagerStyle" />

    <HeaderStyle CssClass="HeaderStyle" Font-Bold="True" ForeColor="White"/>
    <EditRowStyle CssClass="EditRowStyle" />
    <AlternatingRowStyle CssClass="AltRowStyle" /> 
    <HeaderTemplate>
        Employee Information
    </HeaderTemplate>
</asp:DetailsView>

<asp:SqlDataSource ID="SqlDataSource2" runat="server" 
    ConnectionString="<%$ ConnectionStrings:dbConnectionString %>" 
    DeleteCommand="DELETE FROM [Employees] WHERE [EmployeeID] = @EmployeeID" 
    InsertCommand="INSERT INTO [Employees] ([EmployeeID], [FirstName], [LastName], [Email], [SupervisorID], [HireDate], [JobID], [Status]) VALUES (@EmployeeID, @FirstName, @LastName, @Email, @SupervisorID, @HireDate, @JobID, @Status)" 
    ProviderName="<%$ ConnectionStrings:dbConnectionString.ProviderName %>" 
    SelectCommand="SELECT * FROM [Employees] Where [EmployeeID]=@EmployeeID" 
    UpdateCommand="UPDATE [Employees] SET [EmployeeID] = @EmployeeID, [FirstName] = @FirstName, [LastName] = @LastName, [Email] = @Email, [SupervisorID] = @SupervisorID, [HireDate] = @HireDate, [JobID] = @JobID, [Status] = @Status WHERE [ID] = @ID">
    <SelectParameters>
        <asp:QueryStringParameter Name="EmployeeID"
            QueryStringField="EmployeeID" Type="Int32" />
    </SelectParameters>
    <DeleteParameters>
        <asp:Parameter Name="ID" Type="Int64" />
    </DeleteParameters>
    <InsertParameters>
        <asp:Parameter Name="EmployeeID" Type="String" />
        <asp:Parameter Name="FirstName" Type="String" />
        <asp:Parameter Name="LastName" Type="String" />
        <asp:Parameter Name="Email" Type="String" />
        <asp:Parameter Name="SupervisorID" Type="String" />
        <asp:Parameter Name="HireDate" Type="DateTime" />
        <asp:Parameter Name="JobID" Type="Double" />
        <asp:Parameter Name="Status" Type="String" />

    </InsertParameters>
    <UpdateParameters>
        <asp:Parameter Name="EmployeeID" Type="String" />
        <asp:Parameter Name="FirstName" Type="String" />
        <asp:Parameter Name="LastName" Type="String" />
        <asp:Parameter Name="Email" Type="String" />
        <asp:Parameter Name="SupervisorID" Type="String" />
        <asp:Parameter Name="HireDate" Type="DateTime" />
        <asp:Parameter Name="JobID" Type="Double" />
        <asp:Parameter Name="Status" Type="String" />

        <asp:Parameter Name="ID" Type="Int64" />
    </UpdateParameters>
</asp:SqlDataSource>

知道我在这里缺少什么吗？