using System;
   using System.Collections.Generic;
   using System.Text;
   using OnBarcode.Barcode;
   using System.Drawing.Imaging;
   using System.Drawing;


   Linear upca = new Linear();

   // Barcode data to encode
   upca.Data = "12345678912";
   // Barcode symbology type
   //upca.Type = BarcodeType.UPCA;
   upca.Type = BarcodeType.UPCA_2;
   // This property is not working in UPC-A. 
   // According to UPC-A specification, our library will always encode checksum for you.
   upca.AddCheckSum = true;

   /*
   UPC-A Barcode Supplement 2, 5 digits
   */
   // UPC-A supplement data, 2 digits or 5 digits
   upca.SupData = "12";
   // This is a multiplicator of the bar height (Y); The default is 0.8 (80%).
   upca.SupHeight = 0.8f;
   // The separation between the barcode and the supplement barcode. Default is 15 pixel.
   upca.SupSpace = 15;
   /*
   * Barcode Image Related Settings
   */
   // Unit of meature for all size related setting in the library. 
   upca.UOM = UnitOfMeasure.PIXEL;
   // Bar module width (X), default is 1 pixel;
   upca.X = 1;
   // Bar module height (Y), default is 60 pixel;
   upca.Y = 60;
   // Barcode image left, right, top, bottom margins. Defaults are 0.
   upca.LeftMargin = 0;
   upca.RightMargin = 0;
   upca.TopMargin = 0;
   upca.BottomMargin = 0;
   // Image resolution in dpi, default is 72 dpi.
   upca.Resolution = 72;
   // Created barcode orientation.
   //4 options are: facing left, facing right, facing bottom, and facing top
   upca.Rotate = Rotate.Rotate0;
   
   /*
   * Linear barcodes human readable text styles
   */
   // Display human readable text under the barcode
   upca.ShowText = true;
   // Display checksum digit at the end of barcode data.
   upca.ShowCheckSumChar = true;
   // Human readable text font size, font family and style
   upca.TextFont = new Font("Arial", 9f, FontStyle.Regular);
   // Space between barcode and text. Default is 6 pixel.
   upca.TextMargin = 6;

   // Generate UPC-A and encode barcode to gif format
   upca.Format = System.Drawing.Imaging.ImageFormat.Gif;
   upca.drawBarcode("C:\\upca.gif");

   /*
   You can also call other drawing methods to generate barcodes
             
   public void drawBarcode(Graphics graphics);
    
   public void drawBarcode(string filename);
    
   public Bitmap drawBarcode();
    
   public void drawBarcode(Stream stream);
             
   */