default.aspx.cs

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using System;
using System.Data;
using System.Configuration;
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 _Default : System.Web.UI.Page 
{
    public static int year;
    public static int month;
    public static int days;
    protected void Button1_Click(object sender, EventArgs e)
    {
        year = DateTime.Now.Year;
        month = DateTime.Now.Month;
        //得到当前月的天数
        switch (month)
        {
            case 1:
                days = 31;
                break;
            case 2:
                if (DateTime.IsLeapYear(year))
                {
                    //闰年二月为29天
                    days = 29;
                }
                else
                {
                    //不是闰年，二月为28天
                    days = 28;
                }
                break;
            case 3:
                days = 31;
                break;
            case 4:
                days = 30;
                break;
            case 5:
                days = 31;
                break;
            case 6:
                days = 30;
                break;
            case 7:
                days = 31;
                break;
            case 8:
                days = 31;
                break;
            case 9:
                days = 30;
                break;
            case 10:
                days = 31;
                break;
            case 11:
                days = 30;
                break;
            case 12:
                days = 31;
                break;
        }
        TextBox1.Text = days.ToString();
    }
}