.NET Data Matrix barcode generator for c#, vb.net
How to generate, print data matrix 2d barcode label using c#, vb.net, in asp.net, winodws application, with free c# example

     BarCode datamatrix = new BarCode();
     datamatrix.Symbology = KeepAutomation.Barcode.Symbology.DataMatrix;
     datamatrix.CodeToEncode = "Data Matrix";
     datamatrix.X = 3;
     datamatrix.Y = 3;
     datamatrix.generateBarcodeToImageFile("c://barcode-datamatrix-csharp.png");

     Dim datamatrix As KeepAutomation.Barcode.Bean.BarCode = New KeepAutomation.Barcode.Bean.BarCode

     datamatrix.Symbology = KeepAutomation.Barcode.Symbology.DataMatrix
     datamatrix.CodeToEncode = "Data Matrix"
     datamatrix.X = 3
     datamatrix.Y = 3
     datamatrix.generateBarcodeToImageFile("c:/barcode-datamatrix-vbnet.png")

     BarCode datamatrix = new BarCode();
     datamatrix.Symbology = KeepAutomation.Barcode.Symbology.DataMatrix;

     //Data Matrix encoding valid input: All ASCII characters, including 0-9, A-Z, a-z, special characters
     datamatrix.CodeToEncode = "DataMatrix";

     //KeepAutomation provides the following Data Matrix Barcode Data Formats:
     //ASCII: All ASCII characters, including 0-9, A-Z, a-z and special characters like $ , % + / : * etc.
     //Auto: KeepAutomation will select proper data format according to your encoding value.
     //Base256: to encode images, double-byte characters, binary data and 8 bit values.
     //C40: 0-9, A-Z
     //Edifact: 0-9, A-Z, many punctuation marks
     //Text: 0-9, a-z
     //X12: 0-9, A-Z, and some punctuation marks.
     datamatrix.DataMatrixDataMode = DataMatrixDataMode.Auto;
     datamatrix.DataMatrixFormatMode = DataMatrixFormatMode.FM_12X12;

     //Set Data Matrix image size
     //Data Matrix Unit of measure, support pixel, cm and inch.
     datamatrix.BarcodeUnit = BarcodeUnit.Pixel;
     // Data Matrix image resolution in dpi
     datamatrix.DPI = 72;
     // Data Matrix bar module width (X dimention)
     datamatrix.X = 3;
     //Bar module height (Y dimention), Y=X
     datamatrix.Y = 3;

     //Data Matrix image left margin size(quiet zone), the minimum value is X.
     datamatrix.LeftMargin = 9;
     //Image right margin size, the minimum value is X.
     datamatrix.RightMargin = 9;
     datamatrix.TopMargin = 9;
     datamatrix.BottomMargin = 9;
     //Barcode image orientation, 0, 90, 180 and 270 degrees supported.
     datamatrix.Orientation = KeepAutomation.Barcode.Orientation.Degree0;

     //Generate Data Matrix barcodes in PNG image format
     datamatrix.generateBarcodeToImageFile("C://barcode-datamatrix-csharp.png");

     /* Create Data Matrix barcodes in Stream object
     datamatrix.generateBarcodeToStream(".NET System.IO.Stream Object");

     Draw & Print Data Matrix barcodes to Graphics object
     datamatrix.generateBarcodeToGraphics(".NET System.Drawing.Graphics Object");

     Generate Data Matrix barcodes & write to byte[]
     byte[] barcodeInBytes = datamatrix.generateBarcodeToByteArray();

     Generate Data Matrix barcodes & encode to System.Drawing.Bitmap object
     Bitmap barcodeInBitmap = datamatrix.generateBarcodeToBitmap();
     */

     Dim datamatrix As KeepAutomation.Barcode.Bean.BarCode = New KeepAutomation.Barcode.Bean.BarCode
     datamatrix.Symbology = KeepAutomation.Barcode.Symbology.DataMatrix

     'Data Matrix format mode, FM10X10 - FM144X144 supported.
     datamatrix.DataMatrixFormatMode = KeepAutomation.Barcode.DataMatrixFormatMode.FM_12X12

     'Data Matrix data mode, supporting ASCII, Auto, Base256, C40, Edifact, Text, X12.
     datamatrix.DataMatrixDataMode = KeepAutomation.Barcode.DataMatrixDataMode.Auto

     'Set Data Matrix valid input: All ASCII characters, including 0-9, A-Z, a-z, special characters. Length: variable.   
     datamatrix.CodeToEncode = "vbDataMatrixGenerator"

     'Data Matrix unit of measure: pixel, cm and inch  
     datamatrix.BarcodeUnit = KeepAutomation.Barcode.BarcodeUnit.Pixel
     'Data Matrix image resolution in dpi
     datamatrix.DPI = 72

     'Data Matrix image size settings

     'Data Matrix bar module width (X dimention), default is 1 pixel.
     datamatrix.X = 3
     'Data Matrix bar module height (Y dimention), Y=X
     datamatrix.Y = 3
     'Data Matrix image margin size, minimum value is X on all four sides according to specification.
     datamatrix.LeftMargin = 3
     datamatrix.RightMargin = 3
     datamatrix.TopMargin = 3
     datamatrix.BottomMargin = 3

     'Generate and save Data Matrix in Png, Jpeg, Gif, Bmp, Tiff image formats.
     datamatrix.ImageFormat = Drawing.Imaging.ImageFormat.Png
     datamatrix.generateBarcodeToImageFile("C://datamatrix_in_vb.png")