C# KARAKOD OKUMA

//using MessagingToolkit.QRCode.Codec.Data;

            openFileDialog1.ShowDialog();

            string ur = openFileDialog1.FileName.ToString();

            pictureBox1.Image = Image.FromFile(ur);//resmi göster

            MessagingToolkit.QRCode.Codec.QRCodeDecoder decoder = new MessagingToolkit.QRCode.Codec.QRCodeDecoder();