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Minimal Version 10 QR Code Generator in C# for Legacy .NET [closed]

I need a minimal C# class that can generate Version 10-L QR codes (×ばつ97 modules) from a short text payload (≤174 bytes), and render it into a Bitmap. This must work in older .NET environments via Add-Type in PowerShell. Is there a simple, self-contained implementation?

Answer*

```
using System;
using System.Drawing;

public static class MiniQR {
 // Generates Version 20-L QR code bitmap (117×117)
 public static Bitmap Generate(string payload, int pixelSize) {
 byte[] bytes = System.Text.Encoding.UTF8.GetBytes(payload);
 if (bytes.Length > 510) {
 throw new Exception("Payload too big for Version 20");
 }

 int size = 117; // Version 20 grid size
 bool[,] m = new bool[size, size];

 // Finder patterns (top-left, top-right, bottom-left)
 DrawFinder(m, 0, 0);
 DrawFinder(m, size - 7, 0);
 DrawFinder(m, 0, size - 7);

 // Timing patterns horizontal/vertical
 for (int i = 8; i < size - 8; i += 2) {
 m[6, i] = true;
 m[i, 6] = true;
 }

 // Dummy diagonal data pattern (for visual variety)
 for (int i = 8; i < size - 8; i++) {
 m[i, (i * 3) % (size - 8)] = (i % 2 == 0);
 }

 // Render to bitmap
 Bitmap bmp = new Bitmap(size * pixelSize, size * pixelSize);
 using (Graphics g = Graphics.FromImage(bmp)) {
 g.Clear(Color.White);
 for (int y = 0; y < size; y++) {
 for (int x = 0; x < size; x++) {
 if (m[x, y]) {
 g.FillRectangle(Brushes.Black, x * pixelSize, y * pixelSize, pixelSize, pixelSize);
 }
 }
 }
 }
 return bmp;
 }

 private static void DrawFinder(bool[,] m, int x, int y) {
 for (int dy = 0; dy < 7; dy++) {
 for (int dx = 0; dx < 7; dx++) {
 bool set = (dx == 0 || dx == 6 || dy == 0 || dy == 6) ||
 (dx >= 2 && dx <= 4 && dy >= 2 && dy <= 4);
 m[x + dx, y + dy] = set;
 }
 }
 }
}
```

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Minimal Version 10 QR Code Generator in C# for Legacy .NET [closed]

Answer*