SendMail

public static string SendMail(string from, string to, string subject, string body, string smtp)
{
// Create new MailMessage Object
MailMessage message = new MailMessage(from, to, subject, body);

//message.Bcc.Add("someone@tobcc.com");
message.IsBodyHtml = true;

// Create new SmtpClient Object
SmtpClient mailClient = new SmtpClient(smtp, 25);

try
{
// Send eMail and return 1 if successful
// otherwise return error message
mailClient.Send(message);
return "1";
}
catch (System.Net.Mail.SmtpException e)
{
// create or append errors to a log file
CreateLogFiles.CreateLogFiles Err = new CreateLogFiles.CreateLogFiles();
Err.ErrorLog(System.Web.HttpContext.Current.Server.MapPath("/logs/ErrorLog.log"), e.InnerException.Message);
return e.InnerException.Message;
}
}

Email from your GMAIL account using ASP.Net

using System.Web.Mail;
using System;
public class MailSender
{
public static bool SendEmail(
string pGmailEmail,
string pGmailPassword,
string pTo,
string pSubject,
string pBody,
System.Web.Mail.MailFormat pFormat,
string pAttachmentPath)
{
try
{
System.Web.Mail.MailMessage myMail = new System.Web.Mail.MailMessage();
myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpserver","smtp.gmail.com");
myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpserverport","465");
myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusing","2");
//send using: cdoSendUsingPort, value 2, for sending the message using the network.
//smtp authenticate: Specifies the mechanism used when authenticating to an SMTP
//service over the network. Possible values are:
//- cdoAnonymous, value 0. Do not authenticate.
//- cdoBasic, value 1. Use basic clear-text authentication.
//When using this option you have to provide the user name and password
//through the sendusername and sendpassword fields.
//- cdoNTLM, value 2. The current process security context is used to
// authenticate with the service.
myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate","1");
//Use 0 for anonymous
myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername",pGmailEmail);
myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword",pGmailPassword);
myMail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpusessl","true");
myMail.From = pGmailEmail;
myMail.To = pTo;
myMail.Subject = pSubject;
myMail.BodyFormat = pFormat;
myMail.Body = pBody;
if (pAttachmentPath.Trim() != "")
{
MailAttachment MyAttachment = new MailAttachment(pAttachmentPath);
myMail.Attachments.Add(MyAttachment);
myMail.Priority = System.Web.Mail.MailPriority.High;
}

System.Web.Mail.SmtpMail.SmtpServer = "smtp.gmail.com:465";
System.Web.Mail.SmtpMail.Send(myMail);
return true;
}
catch (Exception ex)
{
throw;
}
}
}

//Example usage of this class
EmailLib.SendEmail.SendEmail("your_gmail_id",
"your_gmail_password",
"to_email@anydomain.com",
"This is email subject" ,
"This is email body",
Web.Mail.MailFormat.Text,
"Physical path to your Attachment")