原文发布时间为：2008-07-29 —— 来源于本人的百度文章 [由搬家工具导入]

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default2 : System.Web.UI.Page
{
    protected void Page_Init(object sender, EventArgs e)
    {
        for (int y = 1988; y <=2009; y++)
        {
            DropDownList2.Items.Add(y.ToString());
        }
        for (int m = 1; m <= 12; m++)
        {
            DropDownList3.Items.Add(m.ToString());
        }
        for (int d = 1; d <= 31; d++)
        {
            DropDownList4.Items.Add(d.ToString());
        }

    }
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        switch(DropDownList1.SelectedValue)
        {
            case "day":
                Calendar1.SelectionMode=CalendarSelectionMode.Day;
                break;
            case "week":
                Calendar1.SelectionMode=CalendarSelectionMode.DayWeek;
                break;
            case "month":
                Calendar1.SelectionMode = CalendarSelectionMode.DayWeekMonth;
                break;
            case "none":
                Calendar1.SelectionMode=CalendarSelectionMode.None;
                break ;
        }

    }
    protected void Calendar1_SelectionChanged(object sender, EventArgs e)
    {
        Label1.Text = Calendar1.SelectedDate.ToShortDateString();
        Label2.Text = Calendar1.SelectedDate.Day.ToString();
        Label3.Text = Calendar1.SelectedDate.Month.ToString();
        Label4.Text = Calendar1.SelectedDate.Year.ToString();
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        string y = DropDownList2.SelectedValue.ToString();
        string m = DropDownList3.SelectedValue.ToString();
        string d = DropDownList4.SelectedValue.ToString();
        Calendar1.VisibleDate = Convert.ToDateTime(y + "-" + m + "-" + d);
    }
}

net3：Calendar控件的使用