//Create a new linear barcode object in C#.NET
//Select the barcode type as Code 128 symbology from the barcode type list
BarCode barcode = new BarCode();
barcode.SymbologyType = SymbologyType.Code128;

/*
Set the data characters that are encoded into Code 128 barcode symbology.
Encodable data set of Code 128 contains,
All 128 ASCII characters (characters 0 to 127 inclusive).
Code 128 symbol encodes variable length of data characters
*/
barcode.CodeText = "Abc123";

/*
Enbable the checksum option for Code 128
so that the barcode generator computes check digit to Code 128 automatically
*/
barcode.EnableChecksum = true;

//Set the barcode graphic measurements as Pixel for Code 128
barcode.GraphicsUnit = KeepDynamic.Barcode.Generator.GraphicsUnit.Pixel;

//Assign values of bar width and bar height to Code 128 barcode
barcode.X = 1;
barcode.Y = 80;

// Set generated Code 128 barcode image size
barcode.BarCodeWidth = 150;
barcode.BarCodeHeight = 120;

//Set the margins around the Code 128 symbol
barcode.LeftMargin = 10;
barcode.RightMargin = 10;
barcode.TopMargin = 10;
barcode.BottomMargin = 10;

//Assign a value to resolution for Code 128 image that is drawn to,
//Do not change the orientation of Code 128 barcode image
barcode.Resolution = 72;
barcode.Rotate = Rotate.Rotate0;

//Display the characters encoded into the Code 128 symbology and
//Set the font style of the characters encoded into Code 128
barcode.DisplayCodeText = true;
barcode.CodeTextFont = new System.Drawing.Font("Arial", 11f, System.Drawing.FontStyle.Bold);

//Set Code 128 barcode drawing image format to PNG in C# and
//Generate Code 128 image in C#
barcode.Format = System.Drawing.Imaging.ImageFormat.Png;
barcode.drawBarcode("C://code128-csharp.png");

// other barcode outputting ways:
// output generated barcode to byte array
byte[] barcodeInBytes = barcode.drawBarcodeAsBytes();
    
// output generated barcode to Graphics object
Graphics graphics = ...;
barcode.drawBarcode(graphics);
    
// output generated barcode to Bitmap object
Bitmap barcodeInBitmap = barcode.drawBarcode();
    
// draw created barcode to HttpResponse object
HttpResponse response = ...;
barcode.drawBarcode(response);
    
// save generated barcode images to Stream object
Stream stream = ...;
barcode.drawBarcode(stream);