C# Barcode Reader library for .NET WinForms, WPF Windows Applications

using BarcodeLib.BarcodeReader;
using System;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace BarcodeLib.BarcodeReader.WinFormsDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            this.tbFilePath.ReadOnly = true;
            this.cbBarcodeType.Items.AddRange(new String[] {
                "Codabar", "Code 128 / GS1-128", "Code 39", "Code 39 Full ASCII",
                "Interleaved 2 of 5", "EAN-13", "EAN-8",
                "UPC-A", "UPC-E", "QR Code", "PDF-417",
                 "Data Matrix", "IDENTCODE", "Code 93", "Patch Code",
                "POSTNET","PLANET","RM4SCC", "Australia Post",
                "Intelligent Mail (OneCode)"
            });
            this.cbBarcodeType.SelectedIndex = 1;
            this.btnScan.Enabled = false;
            this.tbResult.ReadOnly = true;
            this.tbResult.Multiline = true;
        }

        private void btnFile_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                try
                {
                    this.tbFilePath.Text = openFileDialog.FileName;
                    this.btnScan.Enabled = true;
                    this.pbImage.Image = Image.FromFile(openFileDialog.FileName);
                }
                catch (Exception) { }
            }
        }

        private void btnScan_Click(object sender, EventArgs 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.");


                OptimizeSetting options = new OptimizeSetting(this.cbBarcodeType.SelectedIndex);

                BarCode[] barcodes = BarcodeReader.ReadBarcode(filePath, options);

                //  Show scan result in the scan result TextBox.
                StringBuilder sb = new StringBuilder();
                if (barcodes.Length > 0)
                {
                    sb.Append("Number of Barcode(s) : " + barcodes.Length + "\r\n\r\n");
                    int index = 1;
                    foreach (BarCode barcodeData in barcodes)
                    {
                        sb.Append(index + ". [" + barcodeData.GetTypeName() + "]: " 
                            + barcodeData.GetMessage() + "\r\n");
                    }
                        
                }
                else
                {
                    sb.Append("No Barcode Detected.");
                }

                this.tbResult.Text = sb.ToString();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
    }
}