在文本框傍边的下拉日历

在前台的页面为一个控件

<%@ Control Language="c#" AutoEventWireup="false" Codebehind="ctlCalendar.ascx.cs" Inherits="purchaseorders.ctlCalendar" TargetSchema="http://schemas.microsoft.com/intellisense/ie5" %>
<asp:textbox id="TextBox1" runat="server" ReadOnly="True" CssClass="text"></asp:textbox>
<input type="button" id="Button1" runat="server" value="" class="text"><br>
<asp:Panel id="pnlCalendar" runat="server">
    <asp:calendar id="Calendar1" runat="server" BorderColor="White" Font-Names="Verdana" Font-Size="9pt"
        Height="190px" ForeColor="Black" Width="350px" BackColor="White" BorderWidth="1px" NextPrevFormat="FullMonth">
        <TodayDayStyle BackColor="#CCCCCC"></TodayDayStyle>
        <NextPrevStyle Font-Size="8pt" Font-Bold="True" ForeColor="#333333" VerticalAlign="Bottom"></NextPrevStyle>
        <DayHeaderStyle Font-Size="8pt" Font-Bold="True"></DayHeaderStyle>
        <SelectedDayStyle ForeColor="White" BackColor="#333399"></SelectedDayStyle>
        <TitleStyle Font-Size="12pt" Font-Bold="True" BorderWidth="4px" ForeColor="#333399" BorderColor="Black"
            BackColor="White"></TitleStyle>
        <OtherMonthDayStyle ForeColor="#999999"></OtherMonthDayStyle>
    </asp:calendar>
</asp:Panel><BR>
<script>

</script>

后台代码：

namespace purchaseorders
{
    using System;
    using System.Data;
    using System.Drawing;
    using System.Web;
    using System.Web.UI.WebControls;
    using System.Web.UI.HtmlControls;

    /**//// <summary>
    ///        Summary description for ctlCalendar.
    /// </summary>
    public class ctlCalendar : System.Web.UI.UserControl
    {
        protected System.Web.UI.WebControls.TextBox TextBox1;
        protected System.Web.UI.WebControls.Panel pnlCalendar;
        protected System.Web.UI.HtmlControls.HtmlInputButton Button1;
        protected System.Web.UI.WebControls.Calendar Calendar1;

        private void Page_Load(object sender, System.EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                this.TextBox1.Text = System.DateTime.Now.ToShortDateString();
                this.pnlCalendar.Attributes.Add("style","DISPLAY: none; POSITION: absolute");
            }
            else
            {
                string id = Page.Request.Form["__EVENTTARGET"].Substring(0,Page.Request.Form["__EVENTTARGET"].IndexOf(":"));
                if (id != this.ID) 
                {
                    this.pnlCalendar.Attributes.Add("style","DISPLAY: none; POSITION: absolute");
                }
                else
                {
                    this.pnlCalendar.Attributes.Add("style","POSITION: absolute");
                }

            }
            Page.RegisterClientScriptBlock("Script_Panel" + this.ID, "<script> function On"+this.ID+"Click() {  if("+this.ID+"_pnlCalendar.style.display == \"none\")     "+this.ID+"_pnlCalendar.style.display = \"\";   else    "+this.ID+"_pnlCalendar.style.display = \"none\"; } </script>");            
            this.Button1.Attributes.Add("OnClick","On"+this.ID+"Click()");
            
        }

        Web Form Designer generated code#region Web Form Designer generated code
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: This call is required by the ASP.NET Web Form Designer.
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /**//// <summary>
        ///        Required method for Designer support - do not modify
        ///        the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.Calendar1.SelectionChanged += new System.EventHandler(this.Calendar1_SelectionChanged);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion

        private void Calendar1_SelectionChanged(object sender, System.EventArgs e)
        {
            this.TextBox1.Text = Calendar1.SelectedDate.ToShortDateString();
            this.pnlCalendar.Attributes.Add("style","DISPLAY: none; POSITION: absolute");
        }

    }
}