ZXing.Net has a built-in QR code generator. Look at this.
Something like this could do the job (the following code has not been tested):
var writer = new BarcodeWriter { Format = BarcodeFormat.QR_CODE, Options = new EncodingOptions { Height = 200, Width = 600 } }; var bitmap = writer.Write("My content");
This should generate an image with a QR code. There are many other possibilities you may encounter.
ZXing is also available as a component for Xamarin.Android, Xamarin.iOS and Windows Phone
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