Hi anirudhp,

Refer below sample.

Refer below article and download the QRcoder dll.

Dynamically generate and display QR code Image in ASP.Net

Namespaces

C#

using QRCoder;
using System.IO;

VB.Net

Imports QRCoder
Imports System.IO

Code

C#

private void btnGenerate_Click(object sender, EventArgs e)
{
    string code = txtCode.Text;
    QRCodeGenerator qrGenerator = new QRCodeGenerator();
    QRCodeGenerator.QRCode qrCode = qrGenerator.CreateQrCode(code, QRCodeGenerator.ECCLevel.Q);
    Bitmap bitMap = qrCode.GetGraphic(5);

    using (MemoryStream ms = new MemoryStream())
    {
        bitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
        byte[] byteImage = ms.ToArray();
        File.WriteAllBytes(@"C:\Users\anand\Desktop\Test.png", byteImage);
        pictureBox1.Image = bitMap;
        pictureBox1.Height = bitMap.Height;
        pictureBox1.Width = bitMap.Width;
    }
}

VB.Net

Private Sub btnGenerate_Click(ByVal sender As Object, ByVal e As EventArgs) Handles button1.Click
    Dim code As String = txtCode.Text
    Dim qrGenerator As QRCodeGenerator = New QRCodeGenerator()
    Dim qrCode As QRCodeGenerator.QRCode = qrGenerator.CreateQrCode(code, QRCodeGenerator.ECCLevel.Q)
    Dim bitMap As Bitmap = qrCode.GetGraphic(5)

    Using ms As MemoryStream = New MemoryStream()
        bitMap.Save(ms, System.Drawing.Imaging.ImageFormat.Png)
        Dim byteImage As Byte() = ms.ToArray()
        File.WriteAllBytes("C:\Users\anand\Desktop\Test.png", byteImage)
        pictureBox1.Image = bitMap
        pictureBox1.Height = bitMap.Height
        pictureBox1.Width = bitMap.Width
    End Using
End Sub

Screenshot