How to save image using memory stream and not use savefiledialog

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WinForms

C#5.0

.NET4.5

I generate qr code for name and country and member

qr code generated without any problem

but i need to use memory stream and not use save file dialog

my code as below

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;
                          
                          
                            string encoding = "UserName : " + textBox4.Text + "\r\n" + "Country : " + comboBox3.Text + "\r\n" + "Membership :" + comboBox5.Text;
                            
                            
                            Bitmap bmp = encoder.Encode(encoding);
                            pictureBox1.Image = bmp;
                            path = sv.FileName;
                            bmp.Save(path, ImageFormat.Jpeg);
                        }

                    }

How to replace save file dialog by using memory stream?

What I have tried:

how to save image using memory stream and not use savefiledialog