Console.Write(@"Type some text to QR code: ");
string sampleText = Console.ReadLine();
QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.M);
QrCode qrCode = qrEncoder.Encode(sampleText);
for (int j = 0; j < qrCode.Matrix.Width; j++)
{
for (int i = 0; i < qrCode.Matrix.Width; i++)
{
char charToPrint = qrCode.Matrix[i, j] ? '█' : ' ';
Console.Write(charToPrint);
}
Console.WriteLine();
}
Console.WriteLine(@"Press any key to quit.");
Console.ReadKey();

const string helloWorld = "Hello World!";
QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.H);
QrCode qrCode = qrEncoder.Encode(helloWorld);
const int moduleSizeInPixels = 5;
Renderer renderer = new Renderer(moduleSizeInPixels, Brushes.Black, Brushes.White);
Panel panel = new Panel();
Point padding = new Point(10,16);
Size qrCodeSize = renderer.Measure(qrCode.Matrix.Width);
panel.AutoSize = false;
panel.Size = qrCodeSize + new Size(2 * padding.X, 2 * padding.Y);
using (Graphics graphics = panel.CreateGraphics())
{
renderer.Draw(graphics, qrCode.Matrix, padding);
}

const string helloWorld = "Hello World!";
QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.H);
QrCode qrCode = new QrCode();
qrEncoder.TryEncode(helloWorld, out qrCode);
const int moduleSizeInPixels = 5;
Renderer renderer = new Renderer(moduleSizeInPixels); //Black&White is default colour for drawing QrCode
//Matrix under qrCode might be null if input string is null or empty. 21 module wide is version 1 QrCode's width. 
int pixelSize = qrCode.Matrix == null ? renderer.Measure(21) : renderer.Measure(qrCode.Matrix.Width);
WriteableBitmap wBitmap = new WriteableBitmap(pixelSize, pixelSize, 96, 96, PixelFormats.Gray8, null);
//If wBitmap is null value. renderer will create Gray8 Bitmap as default.
renderer.Draw(wBitmap, qrCode.Matrix); //Default offset position is (0, 0);
//Now you can put wBitmap to Image control's Source or use it to create image file. 

QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.H);
QrCode qrCode = new QrCode();
qrEncoder.TryEncode(helloWorld, out qrCode);
Renderer renderer = new Renderer(5, Brushes.Black, Brushes.White);
renderer.CreateImageFile(qrCode.Matrix, @"c:\temp\HelloWorld.png", ImageFormat.Png);

QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.H);
QrCode qrCode = new QrCode();
qrEncoder.TryEncode(helloWorld, out qrCode);
Renderer renderer = new Renderer(5, Brushes.Black, Brushes.White);
MemoryStream ms = new MemoryStream();
renderer.WriteToStream(qrCode.Matrix, ms, ImageFormat.png);