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 generate barcode, 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 Vintasoft.Shared.js and Vintasoft.Barcode.js files from "<InstallPath>\VintaSoft Barcode .NET 15.3\Bin\JavaScript\" folder into "Scripts" folder.
  

Client side: Add JavaScript code, which generates and displays barcode image, to the Default web form.

• 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 (an image element that will display generated barcode image) to the web view:
  
  Here is HTML markup code:
  
  • HTML

  <img id="barcodeImage" src="" />
  
  

• Add JavaScript code that generates and displays barcode image:
  
  Here is JavaScript code that generates and displays barcode image:
  
  • JavaScript

  <script type="text/javascript">
      /**
       * Generates 1D barcode image.
       */
      function generate1dBarcodeImage(barcodeType, barcodeValue) {
          // create HTTP handler that allows to generate barcode
          var barcodeService = new Vintasoft.Shared.WebServiceHandlerJS("/Handlers/MyVintasoftBarcodeHandler.ashx");
  
          // create the barcode writer
          var barcodeWriter = new Vintasoft.Barcode.WebBarcodeWriterJS(barcodeService);
  
          // create the barcode writer settings for generating 1D barcode
          var barcodeWriterSettings = new Vintasoft.Barcode.Web1DBarcodeWriterSettingsJS();
          // specify that barcode writer must generate QR barcode image
          barcodeWriterSettings.set_BarcodeType(new Vintasoft.Barcode.Web1DBarcodeTypeEnumJS(barcodeType));
          // specify the Code128 barcode value
          barcodeWriterSettings.set_Value(barcodeValue);
  
          // specify settings for barcode writer
          barcodeWriter.set_Settings(barcodeWriterSettings);
  
          // send an asynchronous request for getting barcode image as Base64 string
          barcodeWriter.getBarcodeAsBase64Image(__writeBarcode_success, __writeBarcode_failed);
      }
  
      /**
       * Generates 2D barcode image.
       */
      function generate2dBarcodeImage(barcodeType, barcodeValue) {
          // create HTTP handler that allows to generate barcode
          var barcodeService = new Vintasoft.Shared.WebServiceHandlerJS("/Handlers/MyVintasoftBarcodeHandler.ashx");
  
          // create the barcode writer
          var barcodeWriter = new Vintasoft.Barcode.WebBarcodeWriterJS(barcodeService);
  
          // create the barcode writer settings for generating 2D barcode
          var barcodeWriterSettings = new Vintasoft.Barcode.Web2DBarcodeWriterSettingsJS();
          // specify that barcode writer must generate QR barcode image
          barcodeWriterSettings.set_BarcodeType(new Vintasoft.Barcode.Web2DBarcodeTypeEnumJS(barcodeType));
          // specify the QR barcode value
          barcodeWriterSettings.set_Value(barcodeValue);
  
          // specify settings for barcode writer
          barcodeWriter.set_Settings(barcodeWriterSettings);
  
          // send an asynchronous request for getting barcode image as Base64 string
          barcodeWriter.getBarcodeAsBase64Image(__writeBarcode_success, __writeBarcode_failed);
      }
  
      /**
       * Barcode is generated successfully.
       */
      function __writeBarcode_success(data) {
          if (data.success) {
              var barcodeImage = data.barcodeImage;
              document.getElementById("barcodeImage").src = barcodeImage;
          }
          else {
              alert(data.errorMessage);
          }
      }
  
      /**
       * Barcode generation is failed.
       */
      function __writeBarcode_failed(data) {
          // show information about error
          alert(data.errorMessage);
      }
  
  
      // set the session identifier
      Vintasoft.Shared.WebImagingEnviromentJS.set_SessionId("SessionID");
      // generate image of QR barcode with value "12345"
      generate2dBarcodeImage("QR", "12345");
  </script>
  
  

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