how to images are sending to mail in asp.net, c# .

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ASP.NET

C#3.5

good morning sir,

i am inserting in the images in bynary format in database.

then my question is how to get the images from database
and send that images to mail,and also i want download that images form mail also.

i was tryed some like .

string emailid = "abc@gmail.com";
MailMessage mm = new MailMessage();
SmtpClient smtp = new SmtpClient();
mm.From = new MailAddress(emailid);
mm.Subject = "File Tracking";
mm.Body = "hai";

Attachment imgAtt = new Attachment(img.ImageUrl.ToString());
// Attachment imgAtt = new Attachment(Server.MapPath("" + ViewState["path"].ToString() + ""));
//give it a content id that corresponds to the src we added in the body img tag
imgAtt.ContentId = ViewState["path"].ToString();
//add the attachment to the email
mm.Attachments.Add(imgAtt);

mm.IsBodyHtml = true;
smtp.Host = "smtp.gmail.com";
smtp.EnableSsl = true;
mm.To.Add(new MailAddress(ViewState["EditVendorEmail"].ToString()));
System.Net.NetworkCredential NetworkCred = new System.Net.NetworkCredential();
NetworkCred.UserName = "abc@gmail.com";//write your gmail user name
NetworkCred.Password = "abc123";// write pass word
smtp.UseDefaultCredentials = true;
smtp.Credentials = NetworkCred;
smtp.Port = 587; //Gmail port for e-mail 465 or 587
smtp.Send(mm);


but i have some doubt in that

Attachment imgAtt = new Attachment(img.ImageUrl.ToString());

in that attachment how to send images (i am geting images from database).and also download sending images from mail.

pls help me ...