[em1]判断日历的:输出格式的 控制,在添加个窗体
namespace 日历
{
    /// <summary>
    /// Form1 的摘要说明。
    /// </summary>
    
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new Form1());
        }

        private void button1_Click(object sender, System.EventArgs e)
        {
            
            data a1=new data();
            //a1.getdata(Convert.ToInt32(textBox1.Text),Convert.ToInt32(textBox2.Text));
            //a1.getdata(int.Parse(textBox1.Text),int.Parse(textBox2.Text));
            //a1.getdata(Convert.ToInt32(numericUpDown1.Value),Convert.ToInt32(textBox2.Text));
            a1.getdata(Convert.ToInt32(numericUpDown1.Value),Convert.ToInt32(comboBox1.Text));
            label1.Text=a1.disp();
        
        }

        private void button3_Click(object sender, System.EventArgs e)
        {
            Application.Exit();
        }

        
}
    class data
    {
        private int []mont={0,31,28,31,30,31,30,31,31,30,31,30,31}; 
        private string []week={"星期日","星期一","星期二","星期三","星期四","星期五","星期六"};
        private int  year,month;
        public void getdata(int y,int m)//获取要查询的年份
        {
            year=y;
            month=m;
        }
        public bool ioleapyear()        //判断该年是不是闰年
        {
            if(year%4==0&&year%100!=0||year%400==0)
                return true;
            else
                return
                    false;
        }
        public int  weekday()               //判断该年该月的第一天是星期几
        {
            int i,days=0;
            if(ioleapyear())
                mont[2]=29;
            for (i=0;i<month;i++) 
                days+=mont[i]; 
            days=year-1+(int)(year-1)/4-(int)(year-1)/100+(int)(year-1)/400+days+1;
            days=days%7;
            return (days);
        }
        //public int monthday(int i);             //该年每个月的天数
        public string disp()                  //显示结果。
        {
            string s;
            int j,d,k,lemp=1;
            int n=weekday(); 
                s='\t'+"                   "+Convert.ToString(year)+"年"+Convert.ToString(month)+"月份"+'\n';
            s+="--------------------------------------------------------"+'\n';
                for(j=0;j<7;j++)
                    s+=week[j]+"  ";
                s+='\n'+"--------------------------------------------------------"+'\n';
                for( k=1;k<=n;k++,lemp++)      //输入每月第一天的起始位置，用空格补充
                    s+="        ";
                if(ioleapyear())
                        mont[2]=29;
                for(d=1;d<=mont[month];d++,lemp++)
                {
                    //s+=" "+Convert.ToString(d)+"     ";
                    s+=String.Format("{0:D2}",d)+"       ";
                    if(lemp==7)
                    {
                        s+='\n';
                        lemp=0;
                    }
                }
            s+='\n'+"--------------------------------------------------------";
            return s;
            
        }
    }
}