BCGColor colorfg = new BCGColor(0, 0, 0);
BCGColor colorbg = new BCGColor(255, 255, 255);

// Aztec Part
BCGaztec code = new BCGaztec();
code.setScale(4);
code.setErrorLevel(23);
code.setSize(BCGaztec.AZTEC_SIZE_SMALLEST);
code.setColor(colorfg, colorbg);
code.setTilde(true);
code.parse("Code 2D!");

// Drawing Part
BCGDrawing drawing = new BCGDrawing(colorbg);
drawing.setBarcode(code);
drawing.draw();

Response.ContentType = "image/png";

drawing.finish(ImageFormat.Png, this.Context.Response.OutputStream);