//Create a new QR Code barcode object in C#.NET,
QRCode barcode = new QRCode();

//Assign the data value to QR Code barcode symbology and QR Code encodes variable data length
barcode.CodeText = "Abc1234567";

/*
 Choose DataMode for QR Code barcode that is going to generate
 Numeric data mode encodes numbers 0 through 9;
 AlphaNumeric encodes digits 0 to 9, all uppercase letters, and special characters(space, $ % * + - . / :);
 byte data mode encodes characters define in ISO/IEC 8859-1;
 Kanji data mode encodes Kanji characters;
*/
barcode.DataMode = QRCodeDataMode.Auto;

//Select a QR Code version from QR Code version list
//Set the Error Correction Level(ECL) to QR Code
barcode.Version = QRCodeVersion.V6;
barcode.ECL = QRCodeECL.L;

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

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

//Assign the values of bar module width to QR Code barcode
barcode.X = 4;

//Set the margins around the QR Code barcode symbology
barcode.LeftMargin = 16;
barcode.RightMargin = 16;
barcode.TopMargin = 16;
barcode.BottomMargin = 16;

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

/*
 Set QR Code barcode drawing image format to PNG in C#
 Generate QR Code barcode image in C#
*/
barcode.Format = System.Drawing.Imaging.ImageFormat.Png;
barcode.drawBarcode("C://barcode-qrcode-csharp1.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);