calendar控件向detailsview输入日期

<asp:DetailsView ID="DetailsView1" runat="server" Height="50px" Width="600px" AutoGenerateInsertButton="True" AutoGenerateRows="False" DataKeyNames="ID" DataSourceID="SqlDataSource1" DefaultMode="Insert">
            <RowStyle HorizontalAlign="Center" />
            <Fields>
                <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True"
                    SortExpression="ID" />
                <asp:BoundField DataField="版本" HeaderText="版本" SortExpression="版本" />
                <asp:TemplateField HeaderText="发布时间" SortExpression="发布时间">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("发布时间") %>'></asp:TextBox>
                    </EditItemTemplate>
                    <InsertItemTemplate>
                        <asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("发布时间") %>' OnTextChanged="TextBox2_TextChanged"></asp:TextBox>
                        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="▼" ToolTip="选择日期" />
                        <asp:Calendar ID="Calendar1" runat="server" OnSelectionChanged="Calendar1_SelectionChanged" Visible="False" BackColor="#FFFFCC" BorderColor="#FFCC66" BorderWidth="1px" DayNameFormat="Shortest" Font-Names="Verdana" Font-Size="8pt" ForeColor="#663399" Height="200px" ShowGridLines="True" Width="220px">
                            <SelectedDayStyle BackColor="#CCCCFF" Font-Bold="True" />
                            <TodayDayStyle BackColor="#FFCC66" ForeColor="White" />
                            <SelectorStyle BackColor="#FFCC66" />
                            <OtherMonthDayStyle ForeColor="#CC9966" />
                            <NextPrevStyle Font-Size="9pt" ForeColor="#FFFFCC" />
                            <DayHeaderStyle BackColor="#FFCC66" Font-Bold="True" Height="1px" />
                            <TitleStyle BackColor="#990000" Font-Bold="True" Font-Size="9pt" ForeColor="#FFFFCC" />
                        </asp:Calendar>
                    </InsertItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="Label2" runat="server" Text='<%# Bind("发布时间") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField HeaderText="说明" SortExpression="说明">
                    <EditItemTemplate>
                        <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("说明") %>'></asp:TextBox>
                    </EditItemTemplate>
                    <InsertItemTemplate>
                        <asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("说明") %>' TextMode="MultiLine" Columns="30" Rows="10"></asp:TextBox>
                    </InsertItemTemplate>
                    <ItemTemplate>
                        <asp:Label ID="Label1" runat="server" Text='<%# Bind("说明") %>'></asp:Label>
                    </ItemTemplate>
                </asp:TemplateField>
            </Fields>
            <HeaderStyle HorizontalAlign="Center" />
        </asp:DetailsView>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:LTSHPARTConnectionString2 %>" DeleteCommand="DELETE FROM [版本] WHERE [ID] = @ID" InsertCommand="INSERT INTO [版本] ([版本], [发布时间], [说明]) VALUES (@版本, @发布时间, @说明)" SelectCommand="SELECT * FROM [版本] ORDER BY [发布时间]" UpdateCommand="UPDATE [版本] SET [版本] = @版本, [发布时间] = @发布时间, [说明] = @说明 WHERE [ID] = @ID">
            <DeleteParameters>
                <asp:Parameter Name="ID" Type="Int32" />
            </DeleteParameters>
            <UpdateParameters>
                <asp:Parameter Name="版本" Type="String" />
                <asp:Parameter Name="发布时间" Type="DateTime" />
                <asp:Parameter Name="说明" Type="String" />
                <asp:Parameter Name="ID" Type="Int32" />
            </UpdateParameters>
            <InsertParameters>
                <asp:Parameter Name="版本" Type="String" />
                <asp:Parameter Name="发布时间" Type="DateTime" />
                <asp:Parameter Name="说明" Type="String" />
            </InsertParameters>
        </asp:SqlDataSource>在 protected void Calendar1_SelectionChanged(object sender, EventArgs e)中
不能直接写Calendar1.SelectedDate，请教下有什么方法。