Introduction:
Here we will learn how to create or generate QR code in asp.net web application using c#, vb.net with example or asp.net dynamically generate and display QR code using c#, vb.net with example or generate and read QR code in asp.net using zxing.Net library in c#, vb.net with example. By using “Zxing.Net” library in asp.net we can easily generate and read QR code in c#, vb.net with example based on our requirements.
Description:
In previous articles I explained create installer file for windows application in visual studio, split string including delimiter at the end in c#, vb.net, asp.net mvc display data from database with example,dictionary in c#, vb.net with examples, reflection to get list of properties and values in c#, vb.net with example, difference between ref and out in c#, vb.net with example and many more articles related toasp.net, mvc, c#, vb.net. Now I will explain how to generate and display QR code in asp.net using c#,vb.net with example.
In asp.net by using “Zxing.Net” library we can generate QR code and read data from that image based on our requirements.
To use “Zxing.Net” library in our application first create new asp.net web application and add Zxing.Net library for that right click on your application à select Manage Nuget Packages à Go to Browse Tabà Search for Zxing.Net à From the list select ZxingNet and install it. Once we install the component that will show like as shown following.
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Once we install Zxing.Net package in our application now open your aspx page and write the code like as shown following.
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Generate and Read QR Code in Asp.Net</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="txtCode" runat="server"></asp:TextBox>
<asp:Button ID="btnGenerate" runat="server" Text="Generate QR Code"OnClick="btnGenerate_Click" />
<hr />
<asp:Image ID="imgQRCode" Width="100px" Height="100px" runat="server" Visible="false" /> <br /><br />
<asp:Button ID="btnRead" Text="Read QR Image" runat="server" OnClick="btnRead_Click" /> <br/><br />
<asp:Label ID="lblQRCode" runat="server"></asp:Label>
</div>
</form>
</body>
</html>
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Now open code behind file and write the code like as shown following
C# Code
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using ZXing;
public partial class GenerateQRCode : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnGenerate_Click(object sender, EventArgs e)
{
GenerateCode(txtCode.Text);
}
protected void btnRead_Click(object sender, EventArgs e)
{
ReadQRCode();
}
// Generate QRCode
private void GenerateCode(string name)
{
var writer = new BarcodeWriter();
writer.Format = BarcodeFormat.QR_CODE;
var result = writer.Write(name);
string path = Server.MapPath("~/images/QRImage.jpg");
var barcodeBitmap = new Bitmap(result);
using (MemoryStream memory = new MemoryStream())
{
using (FileStream fs = new FileStream(path, FileMode.Create, FileAccess.ReadWrite))
{
barcodeBitmap.Save(memory, ImageFormat.Jpeg);
byte[] bytes = memory.ToArray();
fs.Write(bytes, 0, bytes.Length);
}
}
imgQRCode.Visible = true;
imgQRCode.ImageUrl = "~/images/QRImage.jpg";
}
// Read Code from QR Image
private void ReadQRCode()
{
var reader = new BarcodeReader();
string filename = Path.Combine(Request.MapPath("~/images"), "QRImage.jpg");
// Detect and decode the barcode inside the bitmap
var result = reader.Decode(new Bitmap(filename));
if (result != null)
{
lblQRCode.Text = "QR Code: "+ result.Text;
}
}
}
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VB.NET Code
Imports System.Drawing
Imports System.Drawing.Imaging
Imports System.IO
Imports ZXing
Partial Class VBCode
Inherits System.Web.UI.Page
Protected Sub Page_Load(sender As Object, e As EventArgs)
End Sub
Protected Sub btnGenerate_Click(sender As Object, e As EventArgs)
GenerateCode(txtCode.Text)
End Sub
Protected Sub btnRead_Click(sender As Object, e As EventArgs)
ReadQRCode()
End Sub
' Generate QRCode
Private Sub GenerateCode(name As String)
Dim writer = New BarcodeWriter()
writer.Format = BarcodeFormat.QR_CODE
Dim result = writer.Write(name)
Dim path As String = Server.MapPath("~/images/QRImage.jpg")
Dim barcodeBitmap = New Bitmap(result)
Using memory As New MemoryStream()
Using fs As New FileStream(path, FileMode.Create, FileAccess.ReadWrite)
barcodeBitmap.Save(memory, ImageFormat.Jpeg)
Dim bytes As Byte() = memory.ToArray()
fs.Write(bytes, 0, bytes.Length)
End Using
End Using
imgQRCode.Visible = True
imgQRCode.ImageUrl = "~/images/QRImage.jpg"
End Sub
' Read Code from QR Image
Private Sub ReadQRCode()
Dim reader = New BarcodeReader()
Dim filename As String = Path.Combine(Request.MapPath("~/images"), "QRImage.jpg")
' Detect and decode the barcode inside the bitmap
Dim result = reader.Decode(New Bitmap(filename))
If result IsNot Nothing Then
lblQRCode.Text = "QR Code: " + result.Text
End If
End Sub
End Class
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If you observe above code we added a namespace “Zxing” reference in our application to generate and read QR code in our web applications.
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