hi have this code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Windows;
using System.Windows.Media;
using System.Windows.Input;
using Gma.QrCodeNet;
using Gma.QrCodeNet.Encoding;
using Gma.QrCodeNet.Encoding.Windows.WPF;
using System.Windows.Media.Imaging;
using System.Drawing.Imaging;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.H);
QrCode qrCode = new QrCode();
qrEncoder.TryEncode(TextBox1.Text, out qrCode ...
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