c# asp.net 日历控件（9）

<div>
        
                <asp:Calendar ID="Calendar1" runat="server" BackColor="#FFFFCC" 
                        BorderColor="#FFCC66" BorderWidth="1px" DayNameFormat="Shortest" 
                        Font-Names="Verdana" Font-Size="8pt" ForeColor="#663399" Height="200px" 
                        onselectionchanged="Calendar1_SelectionChanged" SelectionMode="DayWeek" 
                        ShowGridLines="True" Width="220px">
                        <SelectedDayStyle BackColor="#CCCCFF" Font-Bold="True" />
                        <SelectorStyle BackColor="#669999" />
                        <WeekendDayStyle BackColor="#CC66FF" BorderColor="#00CC66" ForeColor="#333300" 
                                HorizontalAlign="Center" Wrap="True" />
                        <TodayDayStyle BackColor="#FFCC66" ForeColor="White" />
                        <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>
                <asp:Label ID="Label1" runat="server" Visible="False" 
                        Width="220px" BackColor="#FFCCFF" Font-Names="华文楷体" Font-Overline="False" 
                        Font-Size="Medium" ForeColor="#003366"></asp:Label>
                <br />
                <asp:TextBox ID="TextBox1" runat="server" Visible="False"></asp:TextBox>
                <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="提交" 
                        Visible="False" />
        
        </div>

        public partial class _Default : System.Web.UI.Page
        {
                protected void Page_Load(object sender, EventArgs e)
                {

                }


                protected void Calendar1_SelectionChanged(object sender, EventArgs e)
                {
                                this.Calendar1.SelectionChanged += new EventHandler(Calendar1_SelectionChanged);
                                TextBox1.Visible = true; Button1.Visible = true; Label1.Visible = true;
                                this.Label1.Text = Calendar1.SelectedDate.ToShortDateString();
                                Calendar1.Visible = false;


                    
                }

                protected void Button1_Click(object sender, EventArgs e)
                {
         
                        
                                Label1.Visible = true;
                                this.Label1.Text = this.TextBox1.Text;
                                TextBox1.Visible = false; Button1.Visible = false;