Sending Mail with Attachment in SharePoint 2010

                     string smtpServer = SPAdministrationWebApplication.Local.OutboundMailServiceInstance.Server.Address;

                    string smtpFrom = SPAdministrationWebApplication.Local.OutboundMailSenderAddress;

                     string Email= "EmailID"

                     MailMessage mailMessage = new MailMessage(smtpFrom, Email);

                     mailMessage.Subject = txtSubject.Text;

                     mailMessage.Body = txtBody.Text;

                     WebClient webClient = new WebClient();

                     webClient.Credentials = CredentialCache.DefaultNetworkCredentials;

                     FileStream fs = new FileStream(pathToCheck, FileMode.Open, FileAccess.Read);

                     byte[] data = new byte[fs.Length];

                     fs.Read(data, 0, data.Length);

                     MemoryStream memoryStreamOfFile = new MemoryStream(data);

                     mailMessage.Attachments.Add(new                                   System.Net.Mail.Attachment(memoryStreamOfFile, filename));

                     SmtpClient smtpClient = new SmtpClient(smtpServer);

                     smtpClient.Send(mailMessage);