i save the image in database in binary form how i retrieve display it form database in gridview

UserId  int
ImageName image

 if (FileUpload1.HasFile)
        {
            byte[] ImageName = FileUpload1.FileBytes;
            string query = "Insert into Pictures(UserId,ImageName)values('" + Session["Id"].ToString() + "',@imagename)";
            SqlConnection conn = new SqlConnection(connstr);
            SqlCommand com = new SqlCommand(query, conn);
            com.Parameters.Add("@imagename", SqlDbType.VarBinary).Value = ImageName;
            conn.Open();
            com.ExecuteNonQuery();
            conn.Close();
}