In this article I will explain with an example, how to dynamically generate and display Barcode Image in ASP.Net using C# and VB.Net.
The Barcode Image will be generated using the IDAutomationHC39M Free Version Barcode Font in ASP.Net using C# and VB.Net.
Note: The IDAutomationHC39M Free Version Barcode Font is provided by IDAutomation and they are the creators and owners of the Font and its license.
 
 

Downloading and installing Barcode Font

First you will need to download the Free Barcode Font from the following link.
Download Barcode Font
Once downloaded follow the following steps.
1. Extract the Font from the ZIP file.
2. Double Click, Open the File and then click the Install Button as shown below.
Dynamically Generate and Display Barcode Image in ASP.Net
 
3. After installation is completed, restart your machine.
 
 

HTML Markup

The HTML Markup consists of following controls:
TextBox – For capturing the user input.
Button – For generating Barcode.
The Button has been assigned with an OnClick event handler.
 
Image – For displaying Barcode.
<asp:TextBox ID="txtBarcode" runat="server"></asp:TextBox>
<asp:Button ID="btnGenerate" runat="server" Text="Generate" OnClick="GenerateBarcode" />
<hr />
<asp:Image ID="imgBarcode" runat="server" Visible="false" />
 
 

Namespaces

You will need to import the following namespaces.
C#
using System.IO;
using System.Drawing;
using System.Drawing.Imaging;
 
VB.Net
Imports System.IO
Imports System.Drawing
Imports System.Drawing.Imaging
 
 

Dynamically generating and displaying Barcode Image in ASP.Net

When the Generate Button is clicked, TextBox value is stored and Bitmap and Graphics class objects are created using the Free Barcode Font and the Barcode Graphics is drawn on the Bitmap Image.
Then, Font class object is created where the version is defined and PonitF, SolidBrush class object is created using which the colors are set.
The MemoryStream class object is created and Bitmap Image saved into MemoryStream object and is converted into a BASE64 string and assigned to the ImageUrl property of Image control.
Finally, the Visible property of Image control is set to TRUE.
C#
protected void GenerateBarcode(object sender, EventArgs e)
{
    string barCode = txtBarcode.Text;
    using (Bitmap bitMap = new Bitmap(barCode.Length * 40, 80))
    {
        using (Graphics graphics = Graphics.FromImage(bitMap))
        {
            using (Font font = new Font("IDAutomationHC39M Free Version", 16))
            {
                PointF point = new PointF(2f, 2f);
                SolidBrush blackBrush = new SolidBrush(Color.Black);
                SolidBrush whiteBrush = new SolidBrush(Color.White);
                graphics.FillRectangle(whiteBrush, 0, 0, bitMap.Width, bitMap.Height);
                graphics.DrawString("*" + barCode + "*", font, blackBrush, point);
            }
        }
        using (MemoryStream ms = new MemoryStream())
        {
            bitMap.Save(ms, ImageFormat.Png);
            imgBarcode.ImageUrl = "data:image/png;base64," + Convert.ToBase64String(ms.ToArray());
            imgBarcode.Visible = true;
        }
    }
}
 
VB.Net
Protected Sub GenerateBarcode(ByVal sender As Object, ByVal e As EventArgs)
    Dim barCode As String = txtBarcode.Text
    Using bitMap As Bitmap = New Bitmap(barCode.Length * 40, 80)
        Using graphics As Graphics = graphics.FromImage(bitMap)
            Using font As Font = New Font("IDAutomationHC39M Free Version", 16)
                Dim point As PointF = New PointF(2.0F, 2.0F)
                Dim blackBrush As SolidBrush = New SolidBrush(Color.Black)
                Dim whiteBrush As SolidBrush = New SolidBrush(Color.White)
                graphics.FillRectangle(whiteBrush, 0, 0, bitMap.Width, bitMap.Height)
                graphics.DrawString("*" & barCode & "*", font, blackBrush, point)
            End Using
        End Using
        Using ms As MemoryStream = New MemoryStream()
            bitMap.Save(ms,ImageFormat.Png)
            imgBarcode.ImageUrl = "data:image/png;base64," & Convert.ToBase64String(ms.ToArray())
            imgBarcode.Visible = True
        End Using
    End Using
End Sub
 
 

Screenshot

Dynamically Generate and Display Barcode Image in ASP.Net
 
 

Demo

View Demo
 
 

Downloads

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