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 to asp.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 Tab à
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.
 |
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>
|
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;
}
}
}
|
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
|
If you observe above code we added a namespace “Zxing” reference in our application to
generate and read QR code in our web applications.
Demo
When we run above code we will get result like as shown
below
 |
|
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9 comments :
Hello Suresh,
Is there any possibility to generate QR code using Image
For example
I have one image and i want to convert it into QR code
Please let me know if it is possible?
Thank you in advance.
sir mujhe c# basic pdf or vidio chahiye
aapka youtubu link sent kr dijiye mere email id p
mera email id - ranjeetkumar1430143@gmail.com
mob -8521390143
QR code is good, but is it possible to put photo of existing QR code and scan to get the information?
bro i too want to know how to make comment box work in blogs.. can you pls help me
can we put pic of existing QR code and able to do scanning?
Superb
can you give me link to download Zxing dll
can you give me link to download Zxing dll
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