Check this code snippet..
It may help you.
BarcodeLib.Barcode.QRCode barcode = new BarcodeLib.Barcode.QRCode();
barcode.Data = "123456789012";
barcode.ModuleSize = 3;
barcode.LeftMargin = 0;
barcode.RightMargin = 0;
barcode.TopMargin = 0;
barcode.BottomMargin = 0;
barcode.Encoding = BarcodeLib.Barcode.QRCodeEncoding.Auto;
barcode.Version = BarcodeLib.Barcode.QRCodeVersion.V1;
barcode.ECL = BarcodeLib.Barcode.QRCodeErrorCorrectionLevel.L;
barcode.ImageFormat = System.Drawing.Imaging.ImageFormat.Png;
barcode.drawBarcode("c://barcode.png");
byte[] barcodeInBytes = barcode.drawBarcodeAsBytes();
Graphics graphics = ...;
barcode.drawBarcode(graphics);
HttpResponse response = ...;
barcode.drawBarcode(response);
Stream stream = ...;
barcode.drawBarcode(stream);
Link :
http://www.barcodelib.com/net_barcode/barcode_symbologies/qrcode.html[
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