error during image retrieving from data base

Question

hey i  m using the following code to display image from database it give an errro

error=paramer is not valid  

 

 

MemoryStream stream = new MemoryStream();

con.Open();

SqlCommand command = new SqlCommand("select image from loll", con);

byte[] image = (byte[])command.ExecuteScalar();

stream.Write(image, 0, image.Length);

con.Close();

Bitmap bitmap = new Bitmap(stream);

pictureBox1.Image = bitmap;