//Create a new Data Matrix barcode object in C#.NET,
DataMatrix barcode = new DataMatrix();

//Encode data into Data Matrix barcode symbology
barcode.CodeText = "Abc1234567";

/*
Choose data mode for generating Data Matrix barcode,
1. Auto mode will automatically match the best data mode for you;
2. ASCII mode encodes data that mainly contains ASCII characters (0-127);
3. C40 mode encodes numeric data and upper case characters;
4. Text mode encodes numeric digits and lower case characters;
5. X12 mode encodes the standard ANSI X12 electronic data interchange characters;
6. EDIFACT mode encodes 63 ASCII values (values from 32 to 94) plus an Unlatch character (binary 011111);
7. Base256 mode encode 8 bit values.
*/
barcode.DataMode = DataMatrixDataMode.ASCII;

/*
Select the format mode to Data Matrix barcode.
If the selected format mode have insufficient space to hold the data,
this barcode engine will select the appropriate format mode automatically
*/
barcode.FormatMode = DataMatrixFormatMode.FM_52X52;

//Enable the option of ProcessTilde when the tilde character "~" is necessary
barcode.ProcessTilde = true;

//Set the Data Matrix barcode graphic measurements as Pixel
barcode.GraphicsUnit = KeepDynamic.Barcode.Generator.GraphicsUnit.Pixel;

//Assign the values of bar width to Data Matrix barcode
barcode.X = 3;

//Set the margins around the Data Matrix barcode symbology
barcode.LeftMargin = 3;
barcode.RightMargin = 3;
barcode.TopMargin = 3;
barcode.BottomMargin = 3;

// Set Data Matrix barcode image size
barcode .BarCodeWidth = 180;
barcode.BarCodeHeight = 180;

/*
Set the resolution of Data Matrix barcode image that is drawn to,
and change the Data Matrix barcode image orientation
*/
barcode.Resolution = 72;
barcode.Rotate = Rotate.Rotate0;

/*
Set Data Matrix barcode drawing image format to PNG in C#
Generate Data Matrix barcode image in C#
*/
barcode.Format = System.Drawing.Imaging.ImageFormat.Png;
barcode.drawBarcode("C://barcode-datamatrix-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);