using System;  
    using System.Collections.Generic;  
    using System.ComponentModel;  
    using System.Data;  
    using System.Drawing;  
    using System.Linq;  
    using System.Text;  
    using System.Windows.Forms;  
    using System.IO;  
    using System.Drawing.Drawing2D;  
      
      
    public partial class Form5 : Form  
    {  
        public Form5()  
        {  
            InitializeComponent();  
        }  
        private void button1_Click(object sender, EventArgs e)  
        {  
            Image imgBg = ReturnImage("bg.jpg");//背景图片              
            Bitmap bmp = new Bitmap(imgBg.Width, imgBg.Height);  
            using (Graphics g = Graphics.FromImage(bmp))  
            {  
                g.DrawImage(imgBg, 0, 0);  
                Font font = new Font("宋体", 25, FontStyle.Bold);  
                string s = Calendar.GetCalendar(DateTime.Now.Year, DateTime.Now.Month);  
                g.DrawString(s, font, new SolidBrush(Color.Yellow), imgBg.Width - 400, 10);  
      
                bmp.Save("new.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);  
            }  
        }  
        private Image ReturnImage(string imgPath)  
        {  
            using (FileStream fs = File.OpenRead(imgPath))  
            {  
                Image img = Image.FromStream(fs);  
                return img;  
            }  
        }  
    }  

    using System;  
    using System.Collections.Generic;  
    using System.Linq;  
    using System.Text;  
    using System.Windows.Forms;  
      
    public class Calendar  
    {  
        public static string GetCalendar(int year, int month)  
        {  
            StringBuilder builder = new StringBuilder();  
            builder.Append(" 日 一 二 三 四 五 六\r\n");  
            int hawdays = GetWeeksOfDate(year, month, 1); //这个月的第一天星期几  
            int days = GetDaysOfMonth(year, month); //获取想要输出月份的天数  
            
            for (int i = 1; i <= hawdays * 3; i++) //打印第一排前面的空格  
            {  
                builder.Append(" ");  
            }  
            builder.Append(" ");  
            for (int j = 1; j <= days; j++)  
            {  
                builder.Append(j.ToString().PadLeft(3, ' '));  
      
                if ((hawdays + j) % 7 == 0)  
                    builder.Append("\r\n");  
            }  
            return builder.ToString();  
        }  
          
        //计算星期几: 星期日至星期六的值为0-6  
        public static int GetWeeksOfDate(int year, int month, int day)  
        {  
            DateTime dt = new DateTime(year, month, day);  
            DayOfWeek d = dt.DayOfWeek;  
            return Convert.ToInt32(d);  
        }  
        //获取指定年月的天数  
        public static int GetDaysOfMonth(int year, int month)  
        {  
            DateTime dtCur = new DateTime(year, month, 1);  
            int days = dtCur.AddMonths(1).AddDays(-1).Day;  
            return days;  
        }  
    }