C# Barcode Reader How-Tos
PM > Install-Package OnBarcode.Barcode.Reader
C#: How to Start
Read multi-barcodes
Scan image specified regions
Async & multi-thread scanning
Process Barcode Text
Unicode text
Structured Append data
GS1 data elements
Setup .NET Projects
C# Class (.NET Core)
ASP.NET Core
ASP.NET Core MVC
ASP.NET Framework
WinForms (.NET Core)
WPF (.NET Core)
2D Barcode in C#
Data Matrix
PDF417
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Linear Barcode in C#
Code 39
Code 128
EAN-13
GS1-128
UPC-A

C# Barcode Reader in ASP.NET framework web form app

How to scan, read barcode images for ASP.NET framework web form applications with free C# barcode example source code

Using Free C# Souce Code to scan barcodes in ASP.NET web form framework Application & IIS Projects

This C# tutorial provides a step by step guide for building an ASP.NET framework web form application, where user can upload a image with barcode and scan, read the barcode data message from it. After this tutorial, you will be albe to

Read 20+ barcodes data from images in ASP.NET framework Razor pages, MVC, Blazor web application
Support .NET 9, 8, 7, 6, 5 and .NET Core 3.1, 2.1 ASP.NET Core web application

How to read linear, 2d barcodes in ASP.NET web form application using C#

Download C#.NET Barcode Reader Library
Install C# library to scan barcode images in ASP.NET web form
Step by Step Tutorial

Prerequisites

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Download and install the following software on your computer

Visual Studio 2022
.NET Framework 4
OnBarcode.Barcode.BarcodeScanner.dll (For .NET Framework 4.0)

Create an ASP.NET web form (Framework) application with barcode reader using C#

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1. Create new ASP.NET web form project

Start Visual Studio 2022 and select "Create a new project".

Select "ASP.NET Web Application (.NET Framework)" in the dialog, and then press "Next" button.

Create a new web project with name "OnBarcodeReaderASPNETWebDemo".

Select Empty project template, and then press "Create"

Now, all auto-generated files for ASP.NET framework barcode reader demo web project could be found in the solution explorer.

2. Install Barcode Reader Library dll

Add OnBarcode Barcode Reader library for .NET Framework 4 reference "OnBarcode.Barcode.BarcodeScanner.dll".

3. Add web page to the project

Open "Add New Item" dialog by press [Ctrl+Shift+A]; and add a new item "Index.aspx" to the project.

Copy ALL following codes to replace the content of the file "Index.aspx".

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Index.aspx.cs" Inherits="OnBarcodeReaderASPNETWebDemo.Index" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>OnBarcode Reader ASP.NET Web Demo</title>
</head>
<body>
    <form id="form1" runat="server" enctype="multipart/form-data">
        <div style="text-align:center">
            <br /><br />
            <asp:FileUpload ID="FileUpload1" runat="server" />
            &nbsp;&nbsp;
            Barcode Type:
            &nbsp;
            <asp:DropDownList ID="dropDownListBarcodeType" runat="server" AutoPostBack="true" />
            <br /><br />
            <asp:Button ID="UploadToScan" runat="server" Text="Scan Image" OnClick="UploadToScan_Click" />
            <br /><br />
            Scan Result:
            <br />
            <asp:TextBox ID="ScanResult" runat="server" Text="" Width="500" Height="100" TextMode="MultiLine" ReadOnly="true" />
        </div>
    </form>
</body>
</html>

Copy ALL following codes to replace the content in the file "Index.aspx.cs".

using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using OnBarcode.Barcode.BarcodeScanner;

namespace OnBarcodeReaderASPNETWebDemo
{
    public partial class Index : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!this.IsPostBack)
            {
                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.dropDownListBarcodeType.DataSource = types;
                this.dropDownListBarcodeType.DataBind();
                //  Default Barcode Type: Code 128
                this.dropDownListBarcodeType.SelectedIndex = 5;
            }
        }

        protected void UploadToScan_Click(object sender, EventArgs e)
        {
            if (!this.FileUpload1.HasFile)
                return;

            try
            {
                String filename = Path.GetFileName(this.FileUpload1.FileName);

                StringBuilder sb = new StringBuilder();
                using (MemoryStream ms = new MemoryStream(this.FileUpload1.FileBytes))
                {
                    //  Get enum BarcodeType from ComboBox selected index.
                    BarcodeType barcodeType = (BarcodeType)this.dropDownListBarcodeType.SelectedIndex;

                    String[] result = BarcodeScanner.Scan(ms, barcodeType);
                    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.ScanResult.Text = sb.ToString();
            }
            catch (Exception ex)
            {
                this.ScanResult.Text = "Error: " + ex.Message;
            }
        }
    }
}

4. Set Web.Config

Set start page to "Index.aspx" in Web.Config.

Copy contents in red to the Web.config file.

<?xml version="1.0" encoding="utf-8"?>

<!--
  For more information on how to configure your ASP.NET application, please visit
  https://go.microsoft.com/fwlink/?LinkId=169433
  -->

<configuration>
    <system.web>
      <compilation debug="true" targetFramework="4.0" />
    </system.web>


    <system.webServer>
      <defaultDocument>
        <files>
          <clear />
           <add value="Index.aspx" />
        </files>
      </defaultDocument>
    </system.webServer>


</configuration>

5. Run barcode reader for ASP.NET Framework web form app

It is done. Now press "Ctrl+F5" to run the web project.

Use "Choose File" button to browse and add an image file with barcode(s).

Then, press "Scan Image" button to submit the form to server; and then the scan result would be shown in the scan result textbox as below.

In this page

Start with free trial package: