using System;

public class ToString
{
   public static void Main()
   {
      TimeSpan span;

      // Initialize a time span to zero.
      span = TimeSpan.Zero;
      Console.WriteLine(FormatTimeSpan(span, true));

   }

   private static string FormatTimeSpan(TimeSpan span, bool showSign)
   {
      string sign = String.Empty;
      if (showSign && (span > TimeSpan.Zero)) 
         sign = "+";  

      return sign + span.Days.ToString("00") + "." + 
             span.Hours.ToString("00") + ":" + 
             span.Minutes.ToString("00") + ":" + 
             span.Seconds.ToString("00") + "." + 
             span.Milliseconds.ToString("000");
   }
}

   
     

   
  

using System;
using System.Globalization;

class MainClass {
    public static void Main() {
        // Create some date/time objects
        DateTime dt = new DateTime();
        DateTime dt1 = new DateTime(2001, 12, 31);
        DateTime dt2 = new DateTime(2000, 12, 31, 23, 59, 59);

        // Do some date time math
        DateTime today = DateTime.Today;
        today = today + new TimeSpan(TimeSpan.TicksPerDay);
        Console.WriteLine("Tomorrow is: {0}", today.ToString());
        today = DateTime.Today - new TimeSpan(7 * TimeSpan.TicksPerDay);
        Console.WriteLine("Last Week on this day it was: {0}",today.ToString());
    }
}

   
     

   
  

using System;
    class MainClass
    {
        public static void Main()
        {
            TimeSpan timespan1 = new TimeSpan(2, 12, 0, 0);
            TimeSpan timespan2 = new TimeSpan(4, 12, 0, 0);

            TimeSpan oneWeek = timespan1 + timespan2;

            DateTime now = DateTime.Now;

            DateTime past = now - oneWeek;

            DateTime future = now + oneWeek;

            Console.WriteLine("Now   : {0}", now);
            Console.WriteLine("Past  : {0}", past);
            Console.WriteLine("Future: {0}", future); 

       }
    }

   
     

   
 


using System;
using System.Collections.Generic;
using System.Text;
using System.Timers;

class Program {
    static int counter = 0;

    static string displayString = "This string will appear one letter at a time. ";

    static void Main(string[] args) {
        Timer myTimer = new Timer(100);
        myTimer.Elapsed += new ElapsedEventHandler(WriteChar);
        myTimer.Start();
        Console.ReadKey();
    }

    static void WriteChar(object source, ElapsedEventArgs e) {
        Console.Write(displayString[counter++ % displayString.Length]);
    }
}

    

   
 


using System;
using System.Drawing;
using System.Windows.Forms;
   
class CloseInFive: Form
{
     public static void Main()
     {
          Application.Run(new CloseInFive());
     }
     public CloseInFive()
     {
          Text = "Closing in Five Minutes";
   
          Timer timer    = new Timer();
          timer.Interval = 5 * 60 * 1000;
          timer.Tick    += new EventHandler(TimerOnTick);
          timer.Enabled  = true;
     }
     void TimerOnTick(object obj, EventArgs ea)
     {
          Timer timer = (Timer) obj;
   
          timer.Stop();
          timer.Tick -= new EventHandler(TimerOnTick);
   
          Close();          
     }
}

    

   
 


using System;
using System.Drawing;
using System.Windows.Forms;
   
class SimpleClock: Form
{
     public static void Main()
     {
          Application.Run(new SimpleClock());
     }
     public SimpleClock()
     {
          Timer timer    = new Timer();
          timer.Tick    += new EventHandler(TimerOnTick);
          timer.Interval = 1000;
          timer.Start();
     }
     private void TimerOnTick(object sender, EventArgs ea)
     {
          Invalidate();
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          StringFormat strfmt  = new StringFormat();
          strfmt.Alignment     = StringAlignment.Center;
          strfmt.LineAlignment = StringAlignment.Center;
   
          pea.Graphics.DrawString(DateTime.Now.ToString("F"),
                                  Font, new SolidBrush(ForeColor), 
                                  ClientRectangle, strfmt);
     }
}

    

   
 

using System;
using System.Drawing;
using System.Windows.Forms;
   
class DigitalClock: Form
{
     public static void Main()
     {
          Application.Run(new DigitalClock());
     }
     public DigitalClock()
     {
          ResizeRedraw = true;
          Timer timer    = new Timer();
          timer.Tick    += new EventHandler(TimerOnTick);
          timer.Interval = 1000;
          timer.Start();
     }
     private void TimerOnTick(object obj, EventArgs ea)
     {
          Invalidate();
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          Graphics grfx    = pea.Graphics;
          DateTime dt      = DateTime.Now;
          string   strTime = dt.ToString("d") + "
" + dt.ToString("T");
          SizeF    sizef   = grfx.MeasureString(strTime, Font);
          float    fScale  = Math.Min(ClientSize.Width  / sizef.Width,
                                      ClientSize.Height / sizef.Height);
          Font     font    = new Font(Font.FontFamily,
                                      fScale * Font.SizeInPoints);
   
          StringFormat strfmt = new StringFormat();
          strfmt.Alignment = strfmt.LineAlignment = StringAlignment.Center;
   
          grfx.DrawString(strTime, font, new SolidBrush(ForeColor), 
                          ClientRectangle, strfmt);
     }
}