Testt/WpfApp2/MainWindow.xaml.cs

using IronBarCode;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfApp2
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            QRCode();
        }
        private static void QRCode()
        {
        var myBarcode = BarcodeWriter.CreateBarcode("https://yandex.ru/search/?text=%D0%BC%D0%B0%D1%81%D0%BA%D0%B0+%D0%B4%D0%BB%D1%8F+%D1%82%D0%B5%D0%BB%D0%B5%D1%84%D0%BE%D0%BD%D0%B0+%D0%B2+1%D1%81+%D0%BA%D0%BE%D0%BD%D1%84%D0%B8%D0%B3%D1%83%D1%80%D0%B0%D1%86%D0%B8%D1%8F&lr=47&clid=2598007-830&win=622", BarcodeWriterEncoding.QRCode);

        myBarcode.SaveAsImage("qr.png");
        }
    }
}