html代码：
<%@ Page Language="C#" CodeFile="calendar.aspx.cs" Inherits="calendar" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Panel ID="Panel1" runat="server" Height="27px" Width="540px">
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:Button ID="Button1" runat="server" OnClick="btnOnClick" Text="选择" />
<div id="LayerCC" style="left: 155px; 189px; position: absolute; top: 55px;
height: 191px;
<asp:Calendar ID="Calendar1" runat="server" BackColor="White" BorderColor="#3366CC"
BorderWidth="1px" CellPadding="1" Font-Names="Verdana" Font-Size="8pt" ForeColor="#003399"
Height="200px" OnSelectionChanged="Calendar1_SelectionChanged" Width="220px">
<SelectedDayStyle BackColor="#009999" Font-Bold="True" ForeColor="#CCFF99" />
<SelectorStyle BackColor="#99CCCC" ForeColor="#336666" />
<WeekendDayStyle BackColor="#CCCCFF" />
<TodayDayStyle BackColor="#99CCCC" ForeColor="White" />
<OtherMonthDayStyle ForeColor="#999999" />
<NextPrevStyle Font-Size="8pt" ForeColor="#CCCCFF" />
<DayHeaderStyle BackColor="#99CCCC" ForeColor="#336666" Height="1px" />
<TitleStyle BackColor="#003399" BorderColor="#3366CC" BorderWidth="1px" Font-Bold="True"
Font-Size="10pt" ForeColor="#CCCCFF" Height="25px" />
</asp:Calendar>
</div>
</asp:Panel>
</div>
</form>
</body>
</html>
参考代码C#部分
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public partial class calendar : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnOnClick(object sender, EventArgs e)
{
LayerCC.Visible = !LayerCC.Visible;
}
protected void Calendar1_SelectionChanged(object sender, EventArgs e)
{
TextBox1.Text = Calendar1.SelectedDate.ToString("yyyy-MM-dd");
LayerCC.Visible = false;
}
}
效果图：