How to generate barcode image in C# WPF Windows App?

<Window x:Class="OnBarcodeGeneratorWPFDotNetCoreDemo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:OnBarcodeGeneratorWPFDotNetCoreDemo"
        mc:Ignorable="d"
        Title="MainWindow" Height="480" Width="720">
    <Grid>
        <!-- For Data Message -->
        <Label Content="Data Message:" Margin="15,25,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <TextBox Name="tbData" Text="QRCode" Margin="125,30,0,0" Width="200" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <!-- For Barcode Width -->
        <Label Content="Width (inch):" Margin="15,54,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <TextBox Name="tbWidth" Text="1.0" Margin="125,59,0,0" Width="100" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <!-- For Resolution -->
        <Label Content="Resolution (dpi):" Margin="15,83,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <TextBox Name="tbResolution" Text="300" Margin="125,88,0,0" Width="100" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <!-- Color of Bar Modules in the barcode -->
        <Label Content="Fore Color:" Margin="15,112,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <TextBox Name="tbForeColor" Text="000000" Width="70" Margin="125,117,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <Rectangle Name="rtForeColor" Fill="#000000" Stroke="Black" Width="18" Height="18" Margin="200,117,0,0"
                   HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <!-- Color of Space Modules in the barcode -->
        <Label Content="Back Color:" Margin="15,141,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <TextBox Name="tbBackColor" Text="FFFFFF" Width="70" Margin="125,146,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <Rectangle Name="rtBackColor" Fill="#FFFFFF" Stroke="Black" Width="18" Height="18" Margin="200,146,0,0"
                   HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <!-- Button for updating the barcode preview -->
        <Button Content="Show" Width="72" Margin="100,225,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <!-- Barcode Preview Image -->
        <Image Name="imagePreview" Margin="331,12,0,0" Width="100" Height="100" HorizontalAlignment="Left" VerticalAlignment="Top"/>
    </Grid>
</Window>

using System;
using System.IO;
using System.Drawing;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media.Imaging;
using OnBarcode.Barcode;

namespace OnBarcodeGeneratorWPFDotNetCoreDemo
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            updatePictureBox();
        }

        private void tbForeColor_TextChanged(object sender, TextChangedEventArgs e)
        {
            try
            {
                System.Drawing.Color color = hexStringToColor(this.tbForeColor.Text);
                System.Windows.Media.Color mColor = System.Windows.Media.Color.FromRgb(color.R, color.G, color.B);
                this.rtForeColor.Fill = new System.Windows.Media.SolidColorBrush(mColor);
            }
            catch { }
        }

        private void tbBackColor_TextChanged(object sender, TextChangedEventArgs e)
        {
            try
            {
                System.Drawing.Color color = hexStringToColor(this.tbBackColor.Text);
                System.Windows.Media.Color mColor = System.Windows.Media.Color.FromRgb(color.R, color.G, color.B);
                this.rtBackColor.Fill = new System.Windows.Media.SolidColorBrush(mColor);
            }
            catch { }
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            updatePictureBox();
        }

        private void updatePictureBox()
        {
            try
            {
                // Create new barcode the current settings.
                QRCode barcode = new QRCode();
                barcode.DataMode = QRCodeDataMode.Auto;
                barcode.Data = this.tbData.Text;
                barcode.AutoResize = true;
                barcode.UOM = UnitOfMeasure.INCH;
                barcode.BarcodeWidth = float.Parse(this.tbWidth.Text);
                barcode.BarcodeHeight = float.Parse(this.tbWidth.Text);
                barcode.Resolution = int.Parse(this.tbResolution.Text);
                barcode.ForeColor = hexStringToColor(this.tbForeColor.Text);
                barcode.BackColor = hexStringToColor(this.tbBackColor.Text);
                using (MemoryStream ms = new MemoryStream())
                {
                    // Note: BitmapImage would ignore resolution in Bitmap.
                    System.Drawing.Bitmap bitmap = barcode.drawBarcode();
                    bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
                    BitmapImage bi = new BitmapImage();
                    bi.BeginInit();
                    bi.StreamSource = ms;
                    bi.CacheOption = BitmapCacheOption.OnLoad;
                    bi.EndInit();
                    this.imagePreview.Width = bitmap.Width;
                    this.imagePreview.Height = bitmap.Height;
                    this.imagePreview.Source = bi;
                }
            }
            catch { }
        }

        // Convert hex-string XXXXXX to RGB color
        private System.Drawing.Color hexStringToColor(String hexString)
        {
            if (String.IsNullOrEmpty(hexString))
                return System.Drawing.Color.White;
            // Padding 0 if hexString is less than 6 characters.
            if (hexString.Length < 6)
                hexString = hexString.PadLeft(6, '0');
            try
            {
                int rr = (hexCharToInt(hexString[0]) << 4) + hexCharToInt(hexString[1]);
                int gg = (hexCharToInt(hexString[2]) << 4) + hexCharToInt(hexString[3]);
                int bb = (hexCharToInt(hexString[4]) << 4) + hexCharToInt(hexString[5]);
                return System.Drawing.Color.FromArgb(rr, gg, bb);
            }
            catch (Exception) { }
            return System.Drawing.Color.White;
        }

        private int hexCharToInt(char c)
        {
            if (c >= '0' && c <= '9') return (c - '0');
            if (c >= 'A' && c <= 'F') return (c - 'A') + 10;
            if (c >= 'a' && c <= 'f') return (c - 'a') + 10;
            return 0;
        }
    }
}

<TextBox Name="tbForeColor" Text="000000" Width="70" Margin="125,117,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"
                 TextChanged="tbForeColor_TextChanged"/>

<TextBox Name="tbBackColor" Text="FFFFFF" Width="70" Margin="125,146,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"
                 TextChanged="tbBackColor_TextChanged"/>

<Button Content="Show" Width="72" Margin="100,225,0,0" HorizontalAlignment="Left" VerticalAlignment="Top"
                Click="Button_Click"/>