QR Code Make

Absolutely! Generating QR codes in C# ASP.NET is quite straightforward using libraries like QRCoder (very popular, open-source, and easy to use). Here’s a comprehensive guide for both Web Forms and MVC projects.

1. Install the QRCoder NuGet Package

Use NuGet Package Manager:

Install-Package QRCoder

Or via the NuGet GUI in Visual Studio.

2. Generate QR Code in ASP.NET (Web Forms)

Example: Display QR Code in an Image control

ASPX Page:

Code-behind (C#):

using QRCoder;
using System.Drawing;
using System.IO;

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        string qrText = "https://www.example.com"; // Your URL or text
        using (QRCodeGenerator qrGenerator = new QRCodeGenerator())
        {
            QRCodeData qrCodeData = qrGenerator.CreateQrCode(qrText, QRCodeGenerator.ECCLevel.Q);
            using (QRCode qrCode = new QRCode(qrCodeData))
            {
                using (Bitmap qrCodeImage = qrCode.GetGraphic(20))
                {
                    using (MemoryStream ms = new MemoryStream())
                    {
                        qrCodeImage.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                        byte[] byteImage = ms.ToArray();
                        imgQRCode.ImageUrl = "data:image/png;base64," + Convert.ToBase64String(byteImage);
                    }
                }
            }
        }
    }
}

 This generates a QR code dynamically and displays it in your ASP.NET page.

3. Generate QR Code in ASP.NET MVC

Controller Action:

using QRCoder;
using System.Drawing;
using System.IO;
using System.Web.Mvc;

public ActionResult GenerateQRCode(string text = "https://www.example.com")
{
    using (QRCodeGenerator qrGenerator = new QRCodeGenerator())
    {
        QRCodeData qrCodeData = qrGenerator.CreateQrCode(text, QRCodeGenerator.ECCLevel.Q);
        using (QRCode qrCode = new QRCode(qrCodeData))
        {
            using (Bitmap qrCodeImage = qrCode.GetGraphic(20))
            {
                using (MemoryStream ms = new MemoryStream())
                {
                    qrCodeImage.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                    return File(ms.ToArray(), "image/png");
                }
            }
        }
    }
}

View:

This way, the QR code is generated dynamically and rendered as an image in the browser.

4. Customization Options (QRCoder)

• Pixel size: Adjust the GetGraphic() parameter

• Colors: GetGraphic(20, Color.Black, Color.White) for foreground/background

• Logo in QR: GetGraphic(20, Color.Black, Color.White, logoBitmap)

• Error correction level: L, M, Q, H (higher = more robust but denser)

5. Tips for ASP.NET Projects

• Cache QR codes if generating repeatedly to improve performance.

• For high-traffic websites, consider generating QR codes asynchronously.

• Use PNG for better quality (avoid JPEG artifacts).

For QR code generation, you can utilize Free Spire.Barcode. First, install it via NuGet:

Install-Package FreeSpire.Barcode

Second, refer to the following code to generate a QR code:

using Spire.Barcode;
using System.Drawing.Imaging;

namespace QRGeneration
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // Configure the barcode settings for QR code generation
            var settings = new BarcodeSettings
            {
                // Set barcode type to QR Code
                Type = BarCodeType.QRCode,
                // Set the main data to encode into the QR code
                Data = "https://x.com/",
                Data2D = "https://x.com/",
                // Set error correction level to Medium
                QRCodeECL = QRCodeECL.M,
                // Set the width of the bar module
                X = 3,
                // Hide text (QR code data)
                ShowText = false
            };

            // Create a BarCodeGenerator object using the defined settings
            var generator = new BarCodeGenerator(settings);
            // Generate the QR code image
            var qrCodeImage = generator.GenerateImage();
            // Save the QR code image as a PNG file
            qrCodeImage.Save("simple_qr_code.png", ImageFormat.Png);
        }
    }
}

This library also allows you to personalize QR code, including adding logo and text labels, customizing border, backgroud color, image size and more.

References:

https://www.e-iceblue.com/Tutorials/NET/Spire.Barcode-for-.NET/Program-Guide/Create-and-Scan-Barcode/generate-qr-code-in-asp-net-csharp.html

https://medium.com/@alice.yang_10652/c-qr-code-generator-how-to-create-and-customize-qr-codes-full-guide-42bf9473e187