How To: Barcode Professional SDK in ASP.NET Web Applications

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Product Barcode Professional SDK for .NET Published 05/12/2008 Updated 05/12/2008

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Overview

This walkthrough illustrates how easily you can use Barcode Professional SDK for .NET in ASP.NET Web Applications. During the course of this walkthrough, you will accomplish the following activities:

• Create an ASP.NET Web Site using Visual Studio 2008 or VWD 2008 Express Edition.
• Create a simple ASP.NET WebForm (ASPX) to dynamically generate barcodes.
• Create an ASP.NET HTTP Handler (ASHX) for barcode generation by leveraging Barcode Professional SDK for .NET

Requirements

  Neodynamic Barcode Professional SDK for .NET
  Microsoft .NET Framework 3.5 (ASP.NET 3.5) or greater
  Microsoft Visual Studio 2008
  Microsoft Visual Web Developer 2008 Express Edition (VWD)

Follow up these steps

• Ensure you have installed Barcode Professional SDK for .NET
• Launch Visual Studio 2008 or VWD 2008 and create a new ASP.NET Web Site
• Add a reference to Barcode Professional SDK for .NET assembly (Neodynamic.SDK.Barcode.dll)
• Open Default.ASPX file at design time and in the Source View paste the following content:

  <html xmlns="http://www.w3.org/1999/xhtml">
  <head id="Head1" runat="server">
      <title>Barcode Professional SDK in ASP.NET</title>
      <style type="text/css">
          .newStyle1 {
              font-family: arial, Helvetica, sans-serif;
          }
      </style>
  </head>
  <body>
      <form id="form1" runat="server">
          <div class="newStyle1">
              <h3>Barcode Professional SDK in ASP.NET</h3>
              <br />
              Enter Value to Encode:
              <br />
              <asp:TextBox ID="TextBox1" runat="server" Width="264px">
              </asp:TextBox><asp:Button ID="Button1" runat="server" Text="Barcode Now!" 
                  onclick="Button1_Click" />
              <br />
              <br />
              <asp:Image ID="Image1" runat="server" Visible="false" />
          </div>    
      </form>
  </body>
  </html>      

• In Design View, double click on "Barcode Now!" button and paste the following code in the Button's Click event handler:
  

  VB

  
  If (Me.TextBox1.Text.Length > 0) Then
      Me.Image1.ImageUrl = "~/BarcodeGen.ashx?code=" + Me.TextBox1.Text
      Me.Image1.Visible = True
  End If	    	

  C#

  
  if (this.TextBox1.Text.Length >  0)
  {
      this.Image1.ImageUrl = "~/BarcodeGen.ashx?code=" + this.TextBox1.Text;
      this.Image1.Visible = true;
  }			    

• Add a new item of type "Generic Handler" and name it BarcodeGen.ASHX. In this ASP.NET Handler, we'll create an instance of BarcodeProfessional class for barcode generation. As you'll realize, the code is very simple and straightforward. So after file creation, open it and paste the following code:
  

  VB

  
  <%@ WebHandler Language="VB" Class="BarcodeGen" %>
  
  Imports System
  Imports System.Web
  
  Imports Neodynamic.SDK
  
  Public Class BarcodeGen : Implements IHttpHandler
      
      Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
          
          'Get value to encode from querystring
          Dim valueToEncode As String = context.Request("code")
                  
          'Create BarcodeProfessional object        
          Dim bc As New BarcodeProfessional()
          'Set barcode standard
          bc.Symbology = Symbology.Code128
          'Set value to encode
          bc.Code = valueToEncode
  
          'Generate barcode        
          context.Response.ContentType = "image/gif"
          context.Response.BinaryWrite(bc.GetBarcodeImage(System.Drawing.Imaging.ImageFormat.Gif))
      End Sub
   
      Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
          Get
              Return False
          End Get
      End Property
  
  End Class    	

  C#

  
  <%@ WebHandler Language="C#" Class="BarcodeGen" %>
  
  using System;
  using System.Web;
  
  using Neodynamic.SDK;
  
  public class BarcodeGen : IHttpHandler {
      
      public void ProcessRequest (HttpContext context) {
  
          //Get value to encode from querystring
          string valueToEncode = context.Request["code"];
          
          //Create BarcodeProfessional object        
          BarcodeProfessional bc = new BarcodeProfessional();
          //Set barcode standard
          bc.Symbology = Symbology.Code128;
          //Set value to encode
          bc.Code = valueToEncode;
  
          //Generate barcode        
          context.Response.ContentType = "image/gif";
          context.Response.BinaryWrite(bc.GetBarcodeImage(System.Drawing.Imaging.ImageFormat.Gif));
      }
   
      public bool IsReusable {
          get {
              return false;
          }
      }
  }			    

• That's it. Run your project from VS. You'll get something like the following figure:
  
  
  
  Barcode Professional SDK in ASP.NET Web Applications (Internet Explorer Browser)
  
  
  
  Barcode Professional SDK in ASP.NET Web Applications (Mozilla Firefox Browser)
  
  

Sample Files Download

Here are the VB.NET and C# versions of this sample. Please download the zip file and extract it.

• For Visual Basic.NET: BarcodeSDKSampleASPNETVB.zip (120 KB)
• For Visual C#.NET: BarcodeSDKSampleASPNETCS.zip (120 KB)

Remember to download and install Barcode Professional SDK for .NET in order to reproduce this sample demo.