Cómo cambiar el tamaño de una imagen de código QR

using IronQr;
using IronSoftware.Drawing;

string url = "https://ironsoftware.com/csharp/qr/";

// Generate the QR code data
QrCode qr = QrWriter.Write(url);

// Save using default dimensions
AnyBitmap qrDefault = qr.Save();
qrDefault.SaveAs("qr-default-size.png");

// Define custom resizing
QrStyleOptions styleOptions = new QrStyleOptions
{
    Dimensions = 500
};

// Save using the style options
AnyBitmap qrResized = qr.Save(styleOptions);
qrResized.SaveAs("qr-resized.png");

Imports IronQr
Imports IronSoftware.Drawing

Dim url As String = "https://ironsoftware.com/csharp/qr/"

' Generate the QR code data
Dim qr As QrCode = QrWriter.Write(url)

' Save using default dimensions
Dim qrDefault As AnyBitmap = qr.Save()
qrDefault.SaveAs("qr-default-size.png")

' Define custom resizing
Dim styleOptions As New QrStyleOptions With {
    .Dimensions = 500
}

' Save using the style options
Dim qrResized As AnyBitmap = qr.Save(styleOptions)
qrResized.SaveAs("qr-resized.png")