C# Barcode Reader Library in WPF Core Windows app

<Window x:Class="OnBarcodeReaderWPFDotNetCoreDemo.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:OnBarcodeReaderWPFDotNetCoreDemo"
        mc:Ignorable="d"
        Title="MainWindow" Height="480" Width="720">
<Grid>

    </Grid>
</Window>

<Window x:Class="OnBarcodeReaderWPFDotNetCoreDemo.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:OnBarcodeReaderWPFDotNetCoreDemo"
        mc:Ignorable="d"
        Title="MainWindow" Height="480" Width="720">
    <Grid>
        <!-- For choosing source image file -->
        <Button Name="btChooseFile" Content="Button" Margin="25,35,0,0" Width="120" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <TextBox Name="tbFilePath" Text="" Margin="155,36,0,0" Width="300" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <!-- For selecting barcode type -->
        <Label Content="Barode Type:" Margin="470,31,0,0"  HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <ComboBox Name="cbBarcodeType" Margin="560,33,0,0" Width="120" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <!-- For reading barcode in the file -->
        <Button Name="btScanImage" Content="Scan Image" Margin="280,87,0,0" Width="150" HorizontalAlignment="Left" VerticalAlignment="Top"/>
        <TextBox Name="tbScanResult" Margin="25,140,0,0" Width="668" Height="299" HorizontalAlignment="Left" VerticalAlignment="Top"/>
    </Grid>
</Window>

using System;
using System.Text;
using System.IO;
using System.Windows;
using Microsoft.Win32;
using OnBarcode.Barcode.BarcodeScanner;

namespace OnBarcodeReaderWPFDotNetCoreDemo
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            //  Initial Controls
            this.tbFilePath.IsReadOnly = true;
            String[] types = new String[] {
                "AustraliaPost", "Codabar", "Code39", "Code39Extension", "Code93",
                "Code128", "DataMatrix", "EAN8", "EAN13", "Identcode",
                "IntelligentMail", "Interleaved2of5", "ISBN", "ISSN", "ITF14",
                "Leitcode", "PatchCode", "PDF417", "Planet", "Postnet",
                "QRCode", "RM4SCC", "UPCA", "UPCE"
            };
            this.cbBarcodeType.Items.Clear();
            foreach (String type in types)
                this.cbBarcodeType.Items.Add(type);
            //  Default Barcode Type: Code 128
            this.cbBarcodeType.SelectedIndex = 5;
            this.btScanImage.IsEnabled = false;
            this.tbScanResult.IsReadOnly = true;
        }

        private void btChooseFile_Click(object sender, RoutedEventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            if (openFileDialog.ShowDialog() == true)
            {
                try
                {
                    this.tbFilePath.Text = openFileDialog.FileName;
                    this.btScanImage.IsEnabled = true;
                }
                catch (Exception) { }
            }
        }

        private void btScanImage_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                String filePath = this.tbFilePath.Text;
                if (String.IsNullOrEmpty(filePath))
                    throw new Exception("File path is null or empty.");
                if (!File.Exists(filePath))
                    throw new Exception("File does not exist.");

                //  Get enum BarcodeType from ComboBox selected index.
                BarcodeType barcodeType = (BarcodeType)this.cbBarcodeType.SelectedIndex;

                String[] result = BarcodeScanner.Scan(filePath, barcodeType);

                //  Show scan result in the scan result TextBox.
                StringBuilder sb = new StringBuilder();
                if (result.Length > 0)
                {
                    sb.Append("Number of Barcode: " + result.Length + "\r\n");
                    foreach (String s in result)
                        sb.Append("Message: '" + s + "'\r\n");
                }
                else
                {
                    sb.Append("No Barcode Found.");
                }

                this.tbScanResult.Text = sb.ToString();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButton.OK, MessageBoxImage.Error);
            }
        }
    }
}

<Button Name="btChooseFile" Content="Button" Margin="25,35,0,0" Width="120" HorizontalAlignment="Left" VerticalAlignment="Top"
                Click="btChooseFile_Click"/>

<Button Name="btScanImage" Content="Scan Image" Margin="280,87,0,0" Width="150" HorizontalAlignment="Left" VerticalAlignment="Top"
                Click="btScanImage_Click"/>