How to put image logo within generated qr code

Question

I make windows application to generate c# qr code

I success to do that but i need to put image in center of generated bar code

But How to do that this is actually my question ?

I work in visual studio 2015 windows form applications

i using messagetoolkitqrcode

My code generated qr code by c# as following :

private void button1_Click(object sender, EventArgs e)
        {
            using (SaveFileDialog sv = new SaveFileDialog() { Filter = "JPEG|*.jpg", ValidateNames = true })
            {
                if (sv.ShowDialog()==DialogResult.OK)
                {
                    MessagingToolkit.QRCode.Codec.QRCodeEncoder encoder = new MessagingToolkit.QRCode.Codec.QRCodeEncoder();
                    encoder.QRCodeScale = 8;
                    Bitmap bmp = encoder.Encode(textBox1.Text);
                    pictureBox1.Image = bmp;
                    bmp.Save(sv.FileName, ImageFormat.Jpeg);
                }

            }


        }

How to put logo inside my generated bare code as following image

my logo i need to put inside qr bar code is NASA logo when i generate it as following :

AND logo found in path

c/nasa.jpg