csharp – how to send email with attachment

mailsetting in web.config :

<configuration>
  <system.net>
     <mailSettings>
       <smtp from="your@from.com">
         <network host="localhost" port="25" userName="your_username" password="secret" />
       </smtp>
     </mailSettings>
  </system.net>
</configuration>

source code :

HttpPostedFileBase photo1 = Request.Files["photo1"];
Attachment attach = null;

if (photo1.ContentLength > 0)
{
	var length = photo1.InputStream.Length;
	if (photo1.FileName.EndsWith("jpg") || photo1.FileName.EndsWith("gif") || photo1.InputStream.Length < 3145728)
	{
		attach = new Attachment(photo1.InputStream, "attached_photo");
		attach.ContentType.MediaType = "imgae/jpg";
		attach.ContentDisposition.FileName = "attached_photo.jpg";
	}
}

try
{					
	MailMessage message = new MailMessage();
	message.From = new MailAddress(AppSettings.ContactUsEmailFrom);
	message.To.Add(new MailAddress(AppSettings.ContactUsEmailTo));
	message.Subject = "Test Email Subject";
				
	StringBuilder builder = new StringBuilder();
	builder.AppendLine("Reason: " + model.Reason);
	builder.AppendLine("First Name: " + model.FirstName);
	builder.AppendLine("Last Name: " + model.LastName);
	builder.AppendLine("Email Address: " + model.EmailAddress);
	builder.AppendLine("Address: " + model.Address1 + " " + model.Address2);
	builder.AppendLine("City: " + model.City);
	builder.AppendLine("State: " + model.State);
	builder.AppendLine("----------------------");
	builder.AppendLine("Message: " + model.Message);
	message.Body = builder.ToString();
	if (attach != null)
	{
		message.Attachments.Add(attach);						
	}
					
	SmtpClient client = new SmtpClient();
	client.Send(message);
}
catch
{
	Log.Error("Exception while sending contact us email");
	return RedirectToAction("ThankYou");
}