What is IronQR and how does it enhance QR code reading in C#?

IronQR is a robust .NET QR code reader library developed by Iron Software. It utilizes advanced machine learning models to provide high accuracy in decoding QR codes efficiently within C# applications, even under challenging conditions.

How can I integrate IronQR into my Visual Studio project?

To integrate IronQR into your Visual Studio project, you need to install it via the NuGet package manager. Simply search for IronQR in the NuGet Package Manager and add it to your project to start using its features.

What platforms is IronQR compatible with?

IronQR is compatible with several platforms, including .NET Core (8, 7, 6, 5, and 3.1+), .NET Standard (2.0+), and .NET Framework (4.6.2+). It supports client operating systems like Linux, Unix, and macOS, and can be used for mobile app development.

Can IronQR read QR codes from live video streams?

Yes, IronQR can read QR codes from live video streams. It uses the AForge.Video library to capture images from the camera and decode QR codes in real-time, providing swift and reliable information retrieval.

Is a license required to use IronQR in my projects?

Yes, IronQR requires a license key for use. A trial key can be obtained from the Iron Software website, which allows you to test its features before purchasing a full license.

Does IronQR support both scanning and generating QR codes?

Yes, IronQR is designed to both scan and generate QR code images within the .NET framework, providing a comprehensive solution for handling QR codes in your applications.

How does IronQR ensure the security of QR code data?

IronQR enhances security by using advanced machine learning techniques to discern between authentic QR codes and potential threats, ensuring that only genuine QR code data is decoded.

What are the prerequisites for starting with QR code reading in IronQR?

Before starting, ensure you have Visual Studio or a similar .NET development environment, a camera compatible with your device, and access to NuGet Package Manager for managing installations in your project.

How does IronQR handle different QR code types?

IronQR is designed to decode data in various types of QR codes effortlessly, making it highly versatile for different applications, from reading simple URLs to processing complex structured data.

What is the first step to setting up QR code reading in a C# project using IronQR?

The first step is to create a .NET Windows Forms Application in Visual Studio, which involves selecting the appropriate project template and setting up the environment to utilize IronQR’s QR code reading functionalities.

The C# Barcode Library

Explore IronBarcode Start Free Trial

Barcode Quickstart

See All Code Examples

using IronBarCode;
using System.Drawing;

// Reading a barcode is easy with IronBarcode!
var resultFromFile = BarcodeReader.Read(@"file/barcode.png"); // From a file
var resultFromBitMap = BarcodeReader.Read(new Bitmap("barcode.bmp")); // From a bitmap
var resultFromImage = BarcodeReader.Read(Image.FromFile("barcode.jpg")); // From an image file
var resultFromPdf = BarcodeReader.ReadPdf(@"file/mydocument.pdf"); // From PDF use ReadPdf

// To configure and fine-tune barcode reading, utilize the BarcodeReaderOptions class
var myOptionsExample = new BarcodeReaderOptions
{
    // Choose a reading speed from: Faster, Balanced, Detailed, ExtremeDetail
    // There is a tradeoff in performance as more detail is set
    Speed = ReadingSpeed.Balanced,

    // Reader will stop scanning once a single barcode is found (if set to true)
    ExpectMultipleBarcodes = true,

    // By default, all barcode formats are scanned for
    // Specifying a subset of barcode types to search for would improve performance
    ExpectBarcodeTypes = BarcodeEncoding.AllOneDimensional,

    // Utilize multiple threads to read barcodes from multiple images in parallel
    Multithreaded = true,

    // Maximum threads for parallelized barcode reading
    // Default is 4
    MaxParallelThreads = 2,

    // The area of each image frame in which to scan for barcodes
    // Specifying a crop area will significantly improve performance and avoid noisy parts of the image
    CropArea = new Rectangle(),

    // Special setting for Code39 barcodes
    // If a Code39 barcode is detected, try to read with both the base and extended ASCII character sets
    UseCode39ExtendedMode = true
};

// Read with the options applied
var results = BarcodeReader.Read("barcode.png", myOptionsExample);

// Create a barcode with one line of code
var myBarcode = BarcodeWriter.CreateBarcode("12345", BarcodeWriterEncoding.EAN8);

// After creating a barcode, we may choose to resize
myBarcode.ResizeTo(400, 100);

// Save our newly-created barcode as an image
myBarcode.SaveAsImage("EAN8.jpeg");

// Get the barcode as an image for further processing
var myBarcodeImage = myBarcode.Image;

using IronBarCode;
using System.Drawing;

// Reading a barcode is easy with IronBarcode!
var resultFromFile = BarcodeReader.Read(@"file/barcode.png"); // From a file
var resultFromBitMap = BarcodeReader.Read(new Bitmap("barcode.bmp")); // From a bitmap
var resultFromImage = BarcodeReader.Read(Image.FromFile("barcode.jpg")); // From an image file
var resultFromPdf = BarcodeReader.ReadPdf(@"file/mydocument.pdf"); // From PDF use ReadPdf

// To configure and fine-tune barcode reading, utilize the BarcodeReaderOptions class
var myOptionsExample = new BarcodeReaderOptions
{
    // Choose a reading speed from: Faster, Balanced, Detailed, ExtremeDetail
    // There is a tradeoff in performance as more detail is set
    Speed = ReadingSpeed.Balanced,

    // Reader will stop scanning once a single barcode is found (if set to true)
    ExpectMultipleBarcodes = true,

    // By default, all barcode formats are scanned for
    // Specifying a subset of barcode types to search for would improve performance
    ExpectBarcodeTypes = BarcodeEncoding.AllOneDimensional,

    // Utilize multiple threads to read barcodes from multiple images in parallel
    Multithreaded = true,

    // Maximum threads for parallelized barcode reading
    // Default is 4
    MaxParallelThreads = 2,

    // The area of each image frame in which to scan for barcodes
    // Specifying a crop area will significantly improve performance and avoid noisy parts of the image
    CropArea = new Rectangle(),

    // Special setting for Code39 barcodes
    // If a Code39 barcode is detected, try to read with both the base and extended ASCII character sets
    UseCode39ExtendedMode = true
};

// Read with the options applied
var results = BarcodeReader.Read("barcode.png", myOptionsExample);

// Create a barcode with one line of code
var myBarcode = BarcodeWriter.CreateBarcode("12345", BarcodeWriterEncoding.EAN8);

// After creating a barcode, we may choose to resize
myBarcode.ResizeTo(400, 100);

// Save our newly-created barcode as an image
myBarcode.SaveAsImage("EAN8.jpeg");

// Get the barcode as an image for further processing
var myBarcodeImage = myBarcode.Image;

PM >Install-Package BarCode

Install-Package BarCode

USING IRONBARCODE

C# QR Code Reader (Step by Step Tutorial for Beginner)

Curtis Chau

Updated: April 21, 2026

In today's digitally driven world, QR codes (Quick Response Codes) have become ubiquitous, seamlessly connecting physical and digital realms. From marketing to logistics, finance to healthcare, QR codes play a pivotal role in facilitating efficient data exchange.

In this article, we delve into the realm of C# development, exploring how IronQR, one of the best QR code libraries in the market, empowers developers to harness the power of QR code recognition, effortlessly decode data, and innovate across various domains.

IronQR from Iron Software stands out as a robust .NET QR code reader library. The advanced machine learning model implemented by IronQR empowers your applications to decode QR codes with unmatched accuracy and efficiency, even in challenging scenarios.

How to Read QR Codes using C# with IronQR

Create a Visual Studio project with a .NET Windows Forms Application template.
Install IronQR from the NuGet package manager.
Get the QR code from the camera as an image using the AForge library.
Read QR Codes using IronQR.

IronQR stands out as the premier C# QR code reader library designed to both scan and generate QR code images within the .NET framework. Through the utilization of cutting-edge ML technology, IronQR has elevated QR code reading to unprecedented levels.

Whether you are scanning QR codes from images, videos, or live camera feeds, the ML-powered solution guarantees swift and reliable information retrieval.

This innovative approach not only streamlines data extraction but also enhances security by discerning between authentic QR codes and potential threats. With its intuitive API, developers can seamlessly integrate QR code capabilities into their .NET projects in a matter of minutes.

IronQR seamlessly integrates with .NET Core (8, 7, 6, 5, and 3.1+), .NET Standard (2.0+), and .NET Framework (4.6.2+). The present .NET Core version extends its support to client operating systems like Linux, Unix, and macOS, along with compatibility to develop mobile apps.

Prerequisites

Visual Studio: Make sure you have Visual Studio or any other .NET development environment installed.
Compatible Camera: Ensure that the camera is connected to your device.
NuGet Package Manager: Verify that you can utilize NuGet to manage packages in your project.

Step 1: Create a Visual Studio project with a .NET Windows Forms Application template

Let's get started by creating a Windows Forms .NET application to read QR code barcodes from camera video streams or image files. Open Visual Studio, select Create New Project, and then select the .NET Windows Forms Application template.

Visual Studio Setup

Click Next and enter the project name.

Project Naming

Select the desired .NET Versions and then click the Create button.

Create Project

Step 2: Install IronQR from the NuGet package manager

IronQR can be installed using the NuGet package manager or Visual Studio Package Manager.

NuGet Installation

Below shows how you can do it using Visual Studio.

Visual Studio NuGet

Step 3: Get the QR code from the camera as an image using the AForge Library

To scan QR codes from camera devices, we need to install the AForge.Video.DirectShow library. This can be done using the Visual Studio package manager. Right-click on the Solution Explorer and open the Package Manager.

AForge Installation Step 1

This library can also be installed using the NuGet package console as shown below. Click the Install button to install the library.

AForge Installation Step 2

Step 4: Read QR Codes using IronQR

The next step is to create a PictureBox component in the Form, which is required to scan the QR code image from the camera device connected to the machine.

This can be done by dragging and dropping from the toolbox. This PictureBox is required to read the QR code data from the camera device.

Add PictureBox

Next, drag and drop a Text box to show the read QR codes.

Add TextBox

Add the below code to read QR codes and decode them using IronQR.

using AForge.Video.DirectShow;
using AForge.Video;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using IronQR;

namespace ReadQR
{
    public partial class Form1 : Form
    {
        // Declare a video capture device
        private VideoCaptureDevice videoSource;

        public Form1()
        {
            InitializeComponent();
            this.Load += Form1_Load;
            this.FormClosing += Form1_FormClosing;
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            // Stop the video source when the form is closing
            if (videoSource != null && videoSource.IsRunning)
            {
                videoSource.SignalToStop();
                videoSource.WaitForStop();
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // Retrieve video input devices connected to the machine
            FilterInfoCollection videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);

            if (videoDevices.Count > 0)
            {
                // Use the first available video device
                videoSource = new VideoCaptureDevice(videoDevices[0].MonikerString);
                videoSource.NewFrame += VideoSource_NewFrame;
                videoSource.Start();
            }
            else
            {
                MessageBox.Show("No video devices found.");
                Close();
            }
        }

        private void VideoSource_NewFrame(object sender, NewFrameEventArgs eventArgs)
        {
            // Update the PictureBox with the new frame from the camera
            pictureBox1.Image = (Bitmap)eventArgs.Frame.Clone();

            var image = (Bitmap)eventArgs.Frame.Clone();

            // Set the license key for IronQR. Replace "YourKey" with your actual key
            License.LicenseKey = "YourKey";

            // Prepare the image for QR code reading
            QrImageInput imageInput = new QrImageInput(image);

            // Create a QR reader object
            QrReader reader = new QrReader();

            // Read QR codes from the image
            IEnumerable<QrResult> results = reader.Read(imageInput);

            // Display the first QR code result in a MessageBox
            if (results.Any())
            {
                MessageBox.Show(results.First().Value);
            }
        }
    }
}

using AForge.Video.DirectShow;
using AForge.Video;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using IronQR;

namespace ReadQR
{
    public partial class Form1 : Form
    {
        // Declare a video capture device
        private VideoCaptureDevice videoSource;

        public Form1()
        {
            InitializeComponent();
            this.Load += Form1_Load;
            this.FormClosing += Form1_FormClosing;
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            // Stop the video source when the form is closing
            if (videoSource != null && videoSource.IsRunning)
            {
                videoSource.SignalToStop();
                videoSource.WaitForStop();
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // Retrieve video input devices connected to the machine
            FilterInfoCollection videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);

            if (videoDevices.Count > 0)
            {
                // Use the first available video device
                videoSource = new VideoCaptureDevice(videoDevices[0].MonikerString);
                videoSource.NewFrame += VideoSource_NewFrame;
                videoSource.Start();
            }
            else
            {
                MessageBox.Show("No video devices found.");
                Close();
            }
        }

        private void VideoSource_NewFrame(object sender, NewFrameEventArgs eventArgs)
        {
            // Update the PictureBox with the new frame from the camera
            pictureBox1.Image = (Bitmap)eventArgs.Frame.Clone();

            var image = (Bitmap)eventArgs.Frame.Clone();

            // Set the license key for IronQR. Replace "YourKey" with your actual key
            License.LicenseKey = "YourKey";

            // Prepare the image for QR code reading
            QrImageInput imageInput = new QrImageInput(image);

            // Create a QR reader object
            QrReader reader = new QrReader();

            // Read QR codes from the image
            IEnumerable<QrResult> results = reader.Read(imageInput);

            // Display the first QR code result in a MessageBox
            if (results.Any())
            {
                MessageBox.Show(results.First().Value);
            }
        }
    }
}

Imports AForge.Video.DirectShow
Imports AForge.Video
Imports System
Imports System.Collections.Generic
Imports System.Drawing
Imports System.Linq
Imports System.Windows.Forms
Imports IronQR

Namespace ReadQR
	Partial Public Class Form1
		Inherits Form

		' Declare a video capture device
		Private videoSource As VideoCaptureDevice

		Public Sub New()
			InitializeComponent()
			AddHandler Me.Load, AddressOf Form1_Load
			AddHandler Me.FormClosing, AddressOf Form1_FormClosing
		End Sub

		Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As FormClosingEventArgs)
			' Stop the video source when the form is closing
			If videoSource IsNot Nothing AndAlso videoSource.IsRunning Then
				videoSource.SignalToStop()
				videoSource.WaitForStop()
			End If
		End Sub

		Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
			' Retrieve video input devices connected to the machine
			Dim videoDevices As New FilterInfoCollection(FilterCategory.VideoInputDevice)

			If videoDevices.Count > 0 Then
				' Use the first available video device
				videoSource = New VideoCaptureDevice(videoDevices(0).MonikerString)
				AddHandler videoSource.NewFrame, AddressOf VideoSource_NewFrame
				videoSource.Start()
			Else
				MessageBox.Show("No video devices found.")
				Close()
			End If
		End Sub

		Private Sub VideoSource_NewFrame(ByVal sender As Object, ByVal eventArgs As NewFrameEventArgs)
			' Update the PictureBox with the new frame from the camera
			pictureBox1.Image = DirectCast(eventArgs.Frame.Clone(), Bitmap)

			Dim image = DirectCast(eventArgs.Frame.Clone(), Bitmap)

			' Set the license key for IronQR. Replace "YourKey" with your actual key
			License.LicenseKey = "YourKey"

			' Prepare the image for QR code reading
			Dim imageInput As New QrImageInput(image)

			' Create a QR reader object
			Dim reader As New QrReader()

			' Read QR codes from the image
			Dim results As IEnumerable(Of QrResult) = reader.Read(imageInput)

			' Display the first QR code result in a MessageBox
			If results.Any() Then
				MessageBox.Show(results.First().Value)
			End If
		End Sub
	End Class
End Namespace

Imports AForge.Video.DirectShow
Imports AForge.Video
Imports System
Imports System.Collections.Generic
Imports System.Drawing
Imports System.Linq
Imports System.Windows.Forms
Imports IronQR

Namespace ReadQR
	Partial Public Class Form1
		Inherits Form

		' Declare a video capture device
		Private videoSource As VideoCaptureDevice

		Public Sub New()
			InitializeComponent()
			AddHandler Me.Load, AddressOf Form1_Load
			AddHandler Me.FormClosing, AddressOf Form1_FormClosing
		End Sub

		Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As FormClosingEventArgs)
			' Stop the video source when the form is closing
			If videoSource IsNot Nothing AndAlso videoSource.IsRunning Then
				videoSource.SignalToStop()
				videoSource.WaitForStop()
			End If
		End Sub

		Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
			' Retrieve video input devices connected to the machine
			Dim videoDevices As New FilterInfoCollection(FilterCategory.VideoInputDevice)

			If videoDevices.Count > 0 Then
				' Use the first available video device
				videoSource = New VideoCaptureDevice(videoDevices(0).MonikerString)
				AddHandler videoSource.NewFrame, AddressOf VideoSource_NewFrame
				videoSource.Start()
			Else
				MessageBox.Show("No video devices found.")
				Close()
			End If
		End Sub

		Private Sub VideoSource_NewFrame(ByVal sender As Object, ByVal eventArgs As NewFrameEventArgs)
			' Update the PictureBox with the new frame from the camera
			pictureBox1.Image = DirectCast(eventArgs.Frame.Clone(), Bitmap)

			Dim image = DirectCast(eventArgs.Frame.Clone(), Bitmap)

			' Set the license key for IronQR. Replace "YourKey" with your actual key
			License.LicenseKey = "YourKey"

			' Prepare the image for QR code reading
			Dim imageInput As New QrImageInput(image)

			' Create a QR reader object
			Dim reader As New QrReader()

			' Read QR codes from the image
			Dim results As IEnumerable(Of QrResult) = reader.Read(imageInput)

			' Display the first QR code result in a MessageBox
			If results.Any() Then
				MessageBox.Show(results.First().Value)
			End If
		End Sub
	End Class
End Namespace

Input Image file

The encoded text in the QR code is: I Love IronQR

QR Code Example

Output

QR Code Result

Example Code Explanation

We have registered two events in Windows Forms: Form1_Load and Form1_FormClosing.
We have also registered VideoSource_NewFrame to an instance of videoSource from the AForge.Video.DirectShow library.
We read the QR codes from the live video stream.
When a QR code is detected, we show a MessageBox with the decoded text.

Licensing (Free Trial Available)

IronQR requires a license key. A trial key can be obtained from the website here. This key needs to be placed in appsettings.json.

{
    "IronQR.LicenseKey": "MYLICENSE.KEY.TRIAL"
}

{
    "IronQR.LicenseKey": "MYLICENSE.KEY.TRIAL"
}

JSON

Provide the email ID to get a trial license, and after submitting, the key will be delivered via email.

License Key

Conclusion

In conclusion, QR codes have transcended their origins to become indispensable in our digital ecosystem. With IronQR, C# developers can harness the power of QR code recognition, decode data in various types of QR codes with ease, and innovate across various domains.

As QR codes continue to evolve and integrate into new technologies, their importance in facilitating seamless data exchange and enhancing user experiences will only grow. Embrace the potential of QR codes with IronQR and embark on a journey of innovation and efficiency in C# development.

Curtis Chau

Chat with engineering team now

Technical Writer

Curtis Chau holds a Bachelor’s degree in Computer Science (Carleton University) and specializes in front-end development with expertise in Node.js, TypeScript, JavaScript, and React. Passionate about crafting intuitive and aesthetically pleasing user interfaces, Curtis enjoys working with modern frameworks and creating well-structured, visually appealing manuals.

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