Create a blank Blazor server application.

Add references to Vintasoft.Barcode nuget-package to Blazor server application.

Generate barcode image on Razor page.

• Open "Counter.razor" page
  
  
• Add an "img" element to the "Counter.razor" page
  
  Here is code of "Counter.razor" page after modifications:
  
  • C#

  @page "/counter"
  
  <PageTitle>Counter</PageTitle>
  
  <h1>Counter</h1>
  
  <p role="status">Current count: @currentCount</p>
  
  <button class="btn btn-primary" @onclick="IncrementCount">Click me</button>
  
  <img src="" width="500" height=500 alt="Barcode image" />
  
  @code {
      private int currentCount = 0;
  
      private void IncrementCount()
      {
          currentCount++;
      }
  }
  
  

• Add C# code, which generates barcode image, to the "Counter.razor" page
  
  Here is code of "Counter.razor" page after modifications:
  
  • C#

  // The project, which uses this code, must have references to the following assemblies:
  // - Vintasoft.Barcode
  
  @page "/counter"
  
  <PageTitle>Counter</PageTitle>
  
  <h1>Counter</h1>
  
  <p role="status">Current count: @currentCount</p>
  
  <button class="btn btn-primary" @onclick="IncrementCount">Click me</button>
  
  <img src="@(barcodeImage)" width="500" height=500 alt="Barcode image" />
  
  @code {
      private int currentCount = 0;
  
      private void IncrementCount()
      {
          currentCount++;
      }
  
      private string barcodeImage = GetBarcodeAsSvgBase64Image();
  
      private static string GetSvgBarcodeImage()
      {
          // create the barcode writer
          Vintasoft.Barcode.BarcodeWriter barcodeWriter = new Vintasoft.Barcode.BarcodeWriter();
  
          // set barcode writer settings
          barcodeWriter.Settings.Barcode = Vintasoft.Barcode.BarcodeType.Code39;
          barcodeWriter.Settings.Value = "12345";
  
          // return barcode as SVG image
          return barcodeWriter.GetBarcodeAsSvgFile();
      }
  
      private static string GetBarcodeAsSvgBase64Image()
      {
          // create SVG barcode image
          string svgBarcodeImage = GetSvgBarcodeImage();
  
          // convert SVG barcode image to a byte array
          byte[] svgBarcodeImageAsBytes = System.Text.Encoding.UTF8.GetBytes(svgBarcodeImage);
  
          // convert byte array to a Base64 string
          string svgBarcodeImageAsBase64 = System.Convert.ToBase64String(svgBarcodeImageAsBytes);
  
          // return string that can be used as source of "img" element
          return string.Format("data:image/svg+xml;base64,{0}", svgBarcodeImageAsBase64);
      }
  }
  
  

Run the Blazor server application and see the result.