Create or Generate QR Code in Asp.Net using C# with complete source codes

  C# Projects

In this program we have to use “Zxing.Net” library which will help to generate QR code and read data from that image based on our requirements.

To use “Zxing.Net” library in our website or web 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.

ASP.NET Source Code:-

<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>

CS Codes:-

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;
        }
    }
}