Csharp/C Sharp by API/System.IO/FileMode

FileMode.Open

  
using System; 
using System.IO;  
 
class MainClass { 
  public static void Main(string[] args) { 
    int i; 
    FileStream fin; 
    FileStream fout; 
 
    try { 
      fin = new FileStream("inputFile.txt", FileMode.Open); 
    } catch(FileNotFoundException exc) { 
      Console.WriteLine(exc.Message + "\nInput File Not Found"); 
      return; 
    } 
 
    try { 
      fout = new FileStream("outputFile.txt", FileMode.Create); 
    } catch(IOException exc) { 
      Console.WriteLine(exc.Message + "\nError Opening Output File"); 
      return; 
    } 
 
    try { 
      do { 
        i = fin.ReadByte(); 
        if(i != -1) 
           fout.WriteByte((byte)i); 
      } while(i != -1); 
    } catch(IOException exc) { 
      Console.WriteLine(exc.Message + "File Error"); 
    } 
 
    fin.Close(); 
    fout.Close(); 
  } 
}

FillMode.Alternate

 
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
class FillModesClassical : Form {
    public static void Main() {
        Application.Run(new FillModesClassical());
    }
    public FillModesClassical() {
        ResizeRedraw = true;
        ClientSize = new Size(2 * ClientSize.Height, ClientSize.Height);
    }
    protected override void OnPaint(PaintEventArgs pea) {
        DoPage(pea.Graphics, ForeColor, ClientSize.Width, ClientSize.Height);
    }
    protected void DoPage(Graphics grfx, Color clr, int cx, int cy) {
        Brush brush = new SolidBrush(clr);
        Point[] apt = new Point[5];
        for (int i = 0; i < apt.Length; i++) {
            double dAngle = (i * 0.8 - 0.5) * Math.PI;
            apt[i] = new Point(
                           (int)(cx * (0.25 + 0.24 * Math.Cos(dAngle))),
                           (int)(cy * (0.50 + 0.48 * Math.Sin(dAngle))));
        }
        grfx.FillPolygon(brush, apt, FillMode.Alternate);
    }
}