Create a blank ASP.NET WebForms application.

Server side: Add references to the Vintasoft nuget-packages to ASP.NET WebForms application.

Server side: Add generic handler, which allows to recognize barcodes in image, to ASP.NET WebForms application.

• Add the "Handlers" folder to ASP.NET WebForms application.
• Press the right mouse button on the "Handlers" folder and select the "Add => New Item..." menu from context menu
• Select "Generic Handler" template, set the handler name to the "MyVintasoftBarcodeHandler" and press the "Add" button
  
• Specify that MyVintasoftBarcodeHandler class is derived from Vintasoft.Barcode.Web.HttpHandlers.VintasoftBarcodeHandler class
  
  Here are C# source codes of MyVintasoftBarcodeHandler class:
  
  • C#

  namespace WebApplication1.Handlers
  {
      /// <summary>
      /// Summary description for MyVintasoftBarcodeHandler
      /// </summary>
      public class MyVintasoftBarcodeHandler : Vintasoft.Barcode.Web.HttpHandlers.VintasoftBarcodeHandler
      {
  
          public bool IsReusable
          {
              get
              {
                  return false;
              }
          }
  
      }
  }
  

Client side: Add Vintasoft JavaScript files to the project.

• Add the "Scripts" folder to ASP.NET WebForms Web application.
  
  
• Copy JavaScript-file "Vintasoft.Shared.js" from Github into "Scripts" folder.
  Copy JavaScript-file "Vintasoft.Barcode.js" from Github into "Scripts" folder.
  

Client side: Add JavaScript code, which recognizes barcodes and displays barcode recognition result, to the Default web form.

• Create folder "UploadedImageFiles\SessionID" and copy PNG-image file with barcodes from Github to the folder. We will recognize barcodes in this image.
• Create the Default web form - file "Default.aspx".
  • Press the right mouse button on the project and select the "Add => WebForm" menu from context menu:
    
  • Specify "Default" as web form name => created web form will be opened:
    
• Add references to Vintasoft JavaScript files:
  
  Here is HTML code that adds references to Vintasoft JavaScript files:
  
  • HTML

  <script src="~/Scripts/Vintasoft.Shared.js" type="text/javascript"></script>
  <script src="~/Scripts/Vintasoft.Barcode.js" type="text/javascript"></script>
  
  

• Add HTML markup (a div element that will display barcode recognition result) to the web view:
  
  Here is HTML markup code:
  
  • HTML

  <div id="barcodeInformation"></div>
  

• Add JavaScript code that recognizes barcodes and displays barcode recognition result:
  
  Here is JavaScript code that recognizes barcodes and displays barcode recognition result:
  
  • JavaScript

  <script type="text/javascript">
  
      /**
       * Barcodes are recognized successfully.
       */
      function __readBarcodes_success(data) {
          if (data.success) {
              // get the barcode recognition result
              var barcodeRecognitionResults = data.results;
  
              var htmlMarkup = '';
              // if no barcodes found
              if (barcodeRecognitionResults.length == 0) {
                  htmlMarkup = 'No barcodes found.';
              }
              // if barcodes are found
              else {
                  htmlMarkup = barcodeRecognitionResults.length.toString() + ' barcodes are found.<br />';
                  htmlMarkup += '<br />';
  
                  // for each recognized barcode
                  for (var i = 0; i < barcodeRecognitionResults.length; i++) {
                      // get the barcode recognition result
                      var barcodeRecognitionResult = barcodeRecognitionResults[i];
  
                      // output information about recognized barcode
                      htmlMarkup += '[' + (i + 1) + ':' + barcodeRecognitionResult.barcodeType + ']<br />';
                      htmlMarkup += '  Value: ' + barcodeRecognitionResult.value + '<br />';
                      htmlMarkup += '  Confidence: ' + barcodeRecognitionResult.confidence + '<br />';
                      htmlMarkup += '  Reading quality: ' + barcodeRecognitionResult.readingQuality.toFixed(2) + '<br />';
                      htmlMarkup += '  Threshold: ' + barcodeRecognitionResult.threshold + '<br />';
                      htmlMarkup += '  Region: ' +
                          'LT=(' + barcodeRecognitionResult.region.leftTop.x + ',' + barcodeRecognitionResult.region.leftTop.y + '); ' +
                          'RT=(' + barcodeRecognitionResult.region.rightTop.x + ',' + barcodeRecognitionResult.region.rightTop.y + '); ' +
                          'LB=(' + barcodeRecognitionResult.region.leftBottom.x + ',' + barcodeRecognitionResult.region.leftBottom.y + '); ' +
                          'RB=(' + barcodeRecognitionResult.region.rightBottom.x + ',' + barcodeRecognitionResult.region.rightBottom.y + '); ' +
                          'Angle=' + barcodeRecognitionResult.region.angle.toFixed(1) + '°<br />';
  
                      htmlMarkup += '<br />';
                  }
              }
  
              var barcodeInformationElement = document.getElementById("barcodeInformation");
              barcodeInformationElement.innerHTML = htmlMarkup;
          }
      }
  
      /**
       * Barcode recognition is failed.
       */
      function __readBarcodes_fail(data) {
          // show information about error
          alert(data.errorMessage);
      }
  
  
      // set the session identifier
      Vintasoft.Shared.WebImagingEnviromentJS.set_SessionId("SessionID");
  
      // create HTTP handler that allows to recognize barcodes in image
      var barcodeService = new Vintasoft.Shared.WebServiceHandlerJS("/Handlers/MyVintasoftBarcodeHandler.ashx");
  
      // create the barcode reader
      var barcodeReader = new Vintasoft.Barcode.WebBarcodeReaderJS(barcodeService);
      // specify that Code39 barcode must be searched
      barcodeReader.get_Settings().set_BarcodeType(new Vintasoft.Barcode.WebBarcodeTypeEnumJS("Code39"));
  
      // create web image that references to a file "AllSupportedBarcodes.png" in directory "/UploadedImageFiles/SessionID/"
      var imageSource = new Vintasoft.Shared.WebImageSourceJS("AllSupportedBarcodes.png");
      var image = new Vintasoft.Shared.WebImageJS(imageSource, 0);
  
      // send an asynchronous request for barcode recognition
      barcodeReader.readBarcodes(image, this.__readBarcodes_success, this.__readBarcodes_fail);
  </script>
  
  

Run the ASP.NET WebForms application and see the result.